diff --git a/README.md b/README.md
index 0ef7cfa..e1f2922 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,8 @@ make test
 
 * For use: tarantool, lulpeg, >=tarantool/shard-1.1-91-gfa88bf8 (optional),
   tarantool/avro-schema.
-* For test (additionally to 'for use'): python 2.7, virtualenv, luacheck.
+* For test (additionally to 'for use'): python 2.7, virtualenv, luacheck,
+  >=tarantool/shard-1.1-92-gec1a27e.
 * For building apidoc (additionally to 'for use'): ldoc.
 
 ## License
diff --git a/graphql/accessor_general.lua b/graphql/accessor_general.lua
index e1f8c86..32b6e11 100644
--- a/graphql/accessor_general.lua
+++ b/graphql/accessor_general.lua
@@ -103,7 +103,7 @@ end
 --- Get a key to lookup index by `lookup_index_name` (part of `index_cache`).
 ---
 --- @tparam table filter filter for objects, its keys (names of fields) will
---- form the result
+--- form the result of the function
 ---
 --- @treturn string `name_list_str` (key for lookup by `lookup_index_name`)
 local function filter_names_fingerprint(filter)
@@ -123,14 +123,91 @@ local function filter_names_fingerprint(filter)
     return name_list_str
 end
 
+--- Get an index using parts tree built by @{build_index_parts_tree}.
+---
+--- @tparam table node root of the prefix tree for certain collection
+---
+--- @tparam table filter map of key-value to filter objects against
+---
+--- @treturn string `index_name` or `nil` is found index
+---
+--- @treturn number `max_branch_len` is a number of index parts will be used at
+--- lookup plus 1 (because it calculated artificial root node as well as other
+--- nodes)
+---
+--- Complexity
+--- ----------
+---
+--- In short: O(SIZE(filter)^2 * COUNT(index parts for all indexes)).
+---
+--- Say we have N fields in filter (N = SIZE(filter), M indexes and K index
+--- parts at max ((M * K) and COUNT(index parts for all indexes) both are are
+--- upside limits of nodes count in the tree). We look for successors for
+--- each filter item (<= N items) in each of the tree node (<= M * K nodes),
+--- so have O(I * N * (M * K)) of somewhat we call 'iteration' of I
+--- complexity. Most heavy operation within an iteraton is table.copy(), we
+--- can assume it has O(N) complexity. So we have overall complexity O(N^2 *
+--- (M * K)).
+---
+--- We can consider worst case scenario when any node has any of filter keys as
+--- a successor. In this case nodes count is not real constraint for recursion.
+--- In such case we can calculate complexity as iteration of weight I
+--- (calculated above as O(N^2)) and iteration count as permutations of N
+--- filter items (N!). In such case we'll have O(N^2 * N!) or O(N^(3/2) * N^N)
+--- (Stirling's approximation).
+---
+--- Expectations
+--- ------------
+---
+--- We expect typical filter size as 1 or 2 and tree depth (excluding
+--- artificial root node) of the same order. So despite horrible complexity
+--- estimation it expected to be non-so-heavy. Our guess is that it worth to
+--- try hard to find best index before a large request.
+---
+--- Future optimizations
+--- --------------------
+---
+--- * replace table.copy() with something more light: maybe 'closed set' of
+--    filter items or {remove filter[k], invoke the function, add
+---   back filter[k]} (but it needed to be done in such way that will not
+---   invalidate pairs());
+--- * cache index name btw block requests of the same collection request (when
+---   we'll have block executor) and maybe even btw different requests with the
+--    same filter keys.
+local function get_best_matched_index(node, filter)
+    local index_name = (node.index_names or {})[1]
+    local max_branch_len = 1
+
+    -- optimization: don't run the loop below if there are no successors of the
+    -- current node
+    if node.successors == nil then
+        return index_name, 1
+    end
+
+    for k, v in pairs(filter) do
+        local successor_node = (node.successors or {})[k]
+        if successor_node ~= nil then
+            local new_filter = table.copy(filter)
+            new_filter[k] = nil
+            local branch_index_name, branch_len =
+                get_best_matched_index(successor_node, new_filter)
+            branch_len = branch_len + 1
+            if branch_index_name ~= nil and branch_len > max_branch_len then
+                index_name = branch_index_name
+                max_branch_len = branch_len
+            end
+        end
+    end
+
+    return index_name, max_branch_len
+end
+
 -- XXX: raw idea: we can store field-to-field_no mapping when creating
 -- `lookup_index_name` to faster form the value_list
 
 --- Flatten filter values (transform to a list) against specific index to
 --- passing it to index:pairs().
 ---
---- Only full keys are supported for a compound index for now.
----
 --- @tparam table self the data accessor
 ---
 --- @tparam table filter filter for objects, its values will ordered to form
@@ -146,6 +223,9 @@ end
 --- passed index
 ---
 --- @treturn table `value_list` the value to pass to index:pairs()
+---
+--- @treturn table `new_filter` the `filter` value w/o values extracted to
+--- `value_list`
 local function flatten_filter(self, filter, collection_name, index_name)
     assert(type(self) == 'table',
         'self must be a table, got ' .. type(self))
@@ -155,6 +235,7 @@ local function flatten_filter(self, filter, collection_name, index_name)
         'index_name must be a string, got ' .. type(index_name))
 
     local value_list = {}
+    local new_filter = table.copy(filter)
 
     -- fill value_list
     local index_meta = self.indexes[collection_name][index_name]
@@ -165,6 +246,7 @@ local function flatten_filter(self, filter, collection_name, index_name)
         local value = filter[field_name]
         if value == nil then break end
         value_list[#value_list + 1] = value
+        new_filter[field_name] = nil
     end
 
     -- check for correctness: non-empty value_list
@@ -174,26 +256,11 @@ local function flatten_filter(self, filter, collection_name, index_name)
             json.encode(filter), index_name))
     end
 
-    -- check for correctness: all filter fields are used
-    local count = 0
-    for k, v in pairs(filter) do
-        count = count + 1
-    end
-    if count ~= #value_list then -- avoid extra json.encode()
-        assert(count ~= #value_list,
-            ('filter items count does not match index fields count: ' ..
-            'filter: %s, index_name: %s'):format(json.encode(filter),
-            index_name))
-    end
-
-    local full_match = #value_list == #index_meta.fields
-    return full_match, value_list
+    local full_match = #value_list == #index_meta.fields and
+        next(new_filter) == nil
+    return full_match, value_list, new_filter
 end
 
--- XXX: support partial match for primary/secondary indexes and support to skip
--- fields to get an index (full_match must be false in the case because
--- returned items will be additionally filtered after unflatten).
-
 --- Choose an index for lookup tuple(s) by a 'filter'. The filter holds fields
 --- values of object(s) we want to find. It uses prebuilt `lookup_index_name`
 --- table representing available indexes, which created by the
@@ -232,9 +299,12 @@ end
 ---
 --- @treturn string `index_name` is name of the found index or nil
 ---
---- @treturn table `value_list` is values list from the `filter` argument
---- ordered in the such way that can be passed to the found index (has some
---- meaning only when `index_name ~= nil`)
+--- @treturn table `new_filter` is the filter value w/o values extracted into
+--- `value_list`
+---
+--- @treturn table `value_list` (optional) is values list from the `filter`
+--- argument ordered in the such way that it can be passed to the found index
+-- (has some meaning only when `index_name ~= nil`)
 ---
 --- @treturn table `pivot` (optional) an offset argument represented depending
 --- of a case: whether we'll lookup for the offset by an index; it is either
@@ -261,6 +331,10 @@ local get_index_name = function(self, collection_name, from, filter, args)
     assert(type(lookup_index_name) == 'table',
         'lookup_index_name must be a table, got ' .. type(lookup_index_name))
 
+    local parts_tree = index_cache.parts_tree
+    assert(type(parts_tree) == 'table',
+        'parts_tree must be a table, got ' .. type(parts_tree))
+
     local connection_indexes = index_cache.connection_indexes
     assert(type(connection_indexes) == 'table',
         'connection_indexes must be a table, got ' .. type(connection_indexes))
@@ -278,6 +352,7 @@ local get_index_name = function(self, collection_name, from, filter, args)
         assert(connection_type ~= nil, 'connection_type must not be nil')
         local full_match = connection_type == '1:1' and next(filter) == nil
         local value_list = from.destination_args_values
+        local new_filter = filter
 
         local pivot
         if args.offset ~= nil then
@@ -298,21 +373,22 @@ local get_index_name = function(self, collection_name, from, filter, args)
             pivot = {filter = pivot_filter}
         end
 
-        return full_match, index_name, value_list, pivot
+        return full_match, index_name, new_filter, value_list, pivot
     end
 
     -- The 'fast offset' case. Here we fetch top-level objects starting from
     -- passed offset. Select will be performed by the primary index and
     -- corresponding offset in `pivot.value_list`, then the result will be
-    -- postprocessed using `filter`, if necessary.
+    -- postprocessed using `new_filter`, if necessary.
     if args.offset ~= nil then
         local index_name, index_meta = get_primary_index_meta(self,
             collection_name)
         local full_match
         local pivot_value_list
+        local new_filter = filter
         if type(args.offset) == 'table' then
-            full_match, pivot_value_list = flatten_filter(self, args.offset,
-                collection_name, index_name)
+            full_match, pivot_value_list, new_filter = flatten_filter(self,
+                args.offset, collection_name, index_name)
             assert(full_match == true, 'offset by a partial key is forbidden')
         else
             assert(#index_meta.fields == 1,
@@ -322,22 +398,34 @@ local get_index_name = function(self, collection_name, from, filter, args)
         end
         local pivot = {value_list = pivot_value_list}
         full_match = full_match and next(filter) == nil
-        return full_match, index_name, filter, pivot
+        return full_match, index_name, new_filter, nil, pivot
     end
 
     -- The 'no offset' case. Here we fetch top-level object either by found
     -- index or using full scan (if the index was not found).
+
+    -- try to find full index
     local name_list_str = filter_names_fingerprint(filter)
     assert(lookup_index_name[collection_name] ~= nil,
         ('cannot find any index for collection "%s"'):format(collection_name))
     local index_name = lookup_index_name[collection_name][name_list_str]
     local full_match = false
     local value_list = nil
+    local new_filter = filter
+
+    -- try to find partial index
+    if index_name == nil then
+        local root = parts_tree[collection_name]
+        index_name = get_best_matched_index(root, filter)
+    end
+
+    -- fill full_match and value_list appropriatelly
     if index_name ~= nil then
-        full_match, value_list = flatten_filter(self, filter, collection_name,
-            index_name)
+        full_match, value_list, new_filter = flatten_filter(self, filter,
+            collection_name, index_name)
     end
-    return full_match, index_name, value_list
+
+    return full_match, index_name, new_filter, value_list
 end
 
 --- Build `lookup_index_name` table (part of `index_cache`) to use in the
@@ -404,6 +492,67 @@ local function build_lookup_index_name(indexes)
     return lookup_index_name
 end
 
+--- Build `parts_tree` to use in @{get_index_name} for lookup best matching
+--- index.
+---
+--- @tparam table indexes indexes metainformation as defined in the @{new}
+--- function
+---
+--- Schetch example:
+---
+--- * collection_1:
+---   * index 1 parts: foo, bar, baz;
+---   * index 2 parts: foo, abc;
+---   * index 3 parts: abc, efg, hij;
+--    * index 4 parts: abc.
+---
+--- Resulting table of prefix trees (contains one field for collection_1):
+---
+--- ```
+--- * collection_1:
+---  \
+---   + --> root node --> foo --> bar --> baz ~~> index 1
+---          \             \
+---           \             + --> abc ~~> index 2
+---            \
+---             + ------> abc --> efg --> hij ~~ index 3
+---                        \
+---                         + ~~> index 4
+--- ```
+---
+--- @treturn table `roots` resulting table of prefix trees
+---
+--- * `roots` is a table which maps `collection names` to `root nodes` of
+--- prefix trees;
+--- * 'collection name` is a string (name of a collection);
+--- * `root node` is a table with `successors` field;
+--- * `successors` field value is a map from `index part` to `non-root node`;
+--- * `index part` is a string (name of corresponding field in an object);
+--- * `non-root node` is a table with `index_names` field and optional
+---   `successors` field;
+--- * `index_names` field value is a list of `index name`;
+--- * `index name` is a string (name of an index).
+local function build_index_parts_tree(indexes)
+    local roots = {}
+
+    for collection_name, indexes_meta in pairs(indexes) do
+        local root = {}
+        roots[collection_name] = root
+        for index_name, index_meta in pairs(indexes_meta) do
+            local cur = root
+            for _, field in ipairs(index_meta.fields) do
+                cur.successors = cur.successors or {}
+                cur.successors[field] = cur.successors[field] or {}
+                cur = cur.successors[field]
+                cur.index_names = cur.index_names or {}
+                cur.index_names[#cur.index_names + 1] = index_name
+            end
+        end
+    end
+
+    return roots
+end
+
 --- Build `connection_indexes` table (part of `index_cache`) to use in the
 --- @{get_index_name} function.
 ---
@@ -493,6 +642,7 @@ end
 local function build_index_cache(indexes, collections)
     return {
         lookup_index_name = build_lookup_index_name(indexes),
+        parts_tree = build_index_parts_tree(indexes),
         connection_indexes = build_connection_indexes(indexes, collections),
     }
 end
@@ -683,13 +833,14 @@ local function select_internal(self, collection_name, from, filter, args, extra)
     assert(collection ~= nil,
         ('cannot find the collection "%s"'):format(
         collection_name))
-
-    -- search for suitable index
-    local full_match, index_name, index_value, pivot = get_index_name(
-        self, collection_name, from, filter, args)
     assert(self.funcs.is_collection_exists(collection_name),
         ('cannot find collection "%s"'):format(collection_name))
-    local index = self.funcs.get_index(collection_name, index_name)
+
+    -- search for suitable index
+    local full_match, index_name, filter, index_value, pivot = get_index_name(
+        self, collection_name, from, filter, args) -- we redefine filter here
+    local index = index_name ~= nil and
+        self.funcs.get_index(collection_name, index_name) or nil
     if from.collection_name ~= 'Query' then
         -- allow fullscan only for a top-level object
         assert(index ~= nil,
diff --git a/test-run b/test-run
index ff5fb4f..6d86934 160000
--- a/test-run
+++ b/test-run
@@ -1 +1 @@
-Subproject commit ff5fb4f3016e150ea62d2dcaffcfce645a14b3f8
+Subproject commit 6d86934b6aec96db9636846b9cc7e339e8d52cf0
diff --git a/test/common/lua/multirunner.lua b/test/common/lua/multirunner.lua
index 9e5f97d..5efb876 100755
--- a/test/common/lua/multirunner.lua
+++ b/test/common/lua/multirunner.lua
@@ -30,13 +30,6 @@ end
 
 local function shard_cleanup(test_run, servers)
     test_run:drop_cluster(servers)
-    -- crutch!!
-    -- test_run.lua do not delete servers
-    -- todo: should be removed after #83 is fixed in test-run
-    local drop_cluster_cmd3 = 'delete server %s'
-    for _, name in ipairs(servers) do
-        test_run:cmd(drop_cluster_cmd3:format(name))
-    end
 end
 
 local function for_each_server(shard, func)
diff --git a/test/local/space_compound_index.result b/test/local/space_compound_index.result
index 789eda1..3fad85b 100644
--- a/test/local/space_compound_index.result
+++ b/test/local/space_compound_index.result
@@ -1,3 +1,21 @@
+RUN 1_1 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+user_num: 12
+user_str: user_str_b
+...
+
 RESULT
 ---
 user_collection:
@@ -7,6 +25,51 @@ user_collection:
   user_num: 12
 ...
 
+}}}
+
+RUN 1_2 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+user_str: user_str_b
+first_name: non-existent
+user_num: 12
+...
+
+RESULT
+---
+user_collection: []
+...
+
+}}}
+
+RUN 1_3 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+user_num: 12
+...
+
 RESULT
 ---
 user_collection:
@@ -32,6 +95,183 @@ user_collection:
   user_num: 12
 ...
 
+}}}
+
+RUN 1_4 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+user_str: user_str_b
+...
+
+RESULT
+---
+user_collection:
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 1
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 2
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 3
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 4
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 5
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 6
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 7
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 8
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 9
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 10
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 11
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 12
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 13
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 14
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 15
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 16
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 17
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 18
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 19
+- last_name: last name b
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 20
+...
+
+}}}
+
+RUN 1_5 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+first_name: non-existent
+user_num: 12
+...
+
+RESULT
+---
+user_collection: []
+...
+
+}}}
+
+RUN 1_6 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+first_name: non-existent
+user_str: user_str_b
+...
+
+RESULT
+---
+user_collection: []
+...
+
+}}}
+
+RUN 2_1 {{{
+QUERY
+        query users($user_str: String, $user_num: Long, $description: String) {
+            user_collection(user_str: $user_str, user_num: $user_num) {
+                user_str
+                user_num
+                last_name
+                first_name
+                order_connection(description: $description) {
+                    order_str
+                    order_num
+                    description
+                }
+            }
+        }
+VARIABLES
+---
+user_num: 12
+user_str: user_str_b
+...
+
 RESULT
 ---
 user_collection:
@@ -72,6 +312,63 @@ user_collection:
   last_name: last name b
 ...
 
+}}}
+
+RUN 2_2 {{{
+QUERY
+        query users($user_str: String, $user_num: Long, $description: String) {
+            user_collection(user_str: $user_str, user_num: $user_num) {
+                user_str
+                user_num
+                last_name
+                first_name
+                order_connection(description: $description) {
+                    order_str
+                    order_num
+                    description
+                }
+            }
+        }
+VARIABLES
+---
+user_str: user_str_b
+description: non-existent
+user_num: 12
+...
+
+RESULT
+---
+user_collection:
+- order_connection: []
+  user_str: user_str_b
+  first_name: first name b
+  user_num: 12
+  last_name: last name b
+...
+
+}}}
+
+RUN 3 {{{
+QUERY
+        query users($user_str: String, $user_num: Long) {
+            user_collection(user_str: $user_str, user_num: $user_num) {
+                user_str
+                user_num
+                last_name
+                first_name
+                order_str_connection {
+                    order_str
+                    order_num
+                    description
+                }
+            }
+        }
+VARIABLES
+---
+user_num: 12
+user_str: user_str_b
+...
+
 RESULT
 ---
 user_collection:
@@ -682,6 +979,26 @@ user_collection:
     description: description b
 ...
 
+}}}
+
+RUN 4_1 {{{
+QUERY
+        query users($limit: Int, $offset: user_collection_offset) {
+            user_collection(limit: $limit, offset: $offset) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+offset:
+  user_num: 12
+  user_str: user_str_b
+limit: 10
+...
+
 RESULT
 ---
 user_collection:
@@ -727,7 +1044,59 @@ user_collection:
   user_num: 2
 ...
 
-RESULT: ok: false; err: offset by a partial key is forbidden
+}}}
+
+RUN 4_2 {{{
+QUERY
+        query users($limit: Int, $offset: user_collection_offset) {
+            user_collection(limit: $limit, offset: $offset) {
+                user_str
+                user_num
+                last_name
+                first_name
+            }
+        }
+VARIABLES
+---
+offset:
+  user_str: user_str_b
+limit: 10
+...
+
+RESULT
+---
+ok: false
+err: offset by a partial key is forbidden
+...
+
+}}}
+
+RUN 5_1 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $limit: Int, $offset: order_collection_offset) {
+            user_collection(user_str: $user_str, user_num: $user_num) {
+                user_str
+                user_num
+                last_name
+                first_name
+                order_connection(limit: $limit, offset: $offset) {
+                    order_str
+                    order_num
+                    description
+                }
+            }
+        }
+VARIABLES
+---
+offset:
+  order_num: 1202
+  order_str: order_str_b_2
+user_str: user_str_b
+limit: 4
+user_num: 12
+...
+
 RESULT
 ---
 user_collection:
@@ -750,4 +1119,38 @@ user_collection:
   last_name: last name b
 ...
 
-RESULT: ok: false; err: offset by a partial key is forbidden: expected "order_num" field
+}}}
+
+RUN 5_2 {{{
+QUERY
+        query users($user_str: String, $user_num: Long,
+                $limit: Int, $offset: order_collection_offset) {
+            user_collection(user_str: $user_str, user_num: $user_num) {
+                user_str
+                user_num
+                last_name
+                first_name
+                order_connection(limit: $limit, offset: $offset) {
+                    order_str
+                    order_num
+                    description
+                }
+            }
+        }
+VARIABLES
+---
+offset:
+  order_str: order_str_b_2
+user_str: user_str_b
+limit: 4
+user_num: 12
+...
+
+RESULT
+---
+ok: false
+err: 'offset by a partial key is forbidden: expected "order_num" field'
+...
+
+}}}
+
diff --git a/test/shard_no_redundancy/shard_common.result b/test/shard_no_redundancy/shard_common.result
index 11768fb..b5fcacc 100644
--- a/test/shard_no_redundancy/shard_common.result
+++ b/test/shard_no_redundancy/shard_common.result
@@ -63,6 +63,9 @@ test_run:cmd('switch default')
 ---
 - true
 ...
+shard.reload_schema()
+---
+...
 -- upload test data
 testdata.fill_test_data(shard)
 ---
diff --git a/test/shard_no_redundancy/shard_common.test.lua b/test/shard_no_redundancy/shard_common.test.lua
index 91855c2..65a87f2 100644
--- a/test/shard_no_redundancy/shard_common.test.lua
+++ b/test/shard_no_redundancy/shard_common.test.lua
@@ -33,6 +33,7 @@ require('test.testdata.common_testdata').init_spaces()
 test_run:cmd('switch shard2')
 require('test.testdata.common_testdata').init_spaces()
 test_run:cmd('switch default')
+shard.reload_schema()
 
 -- upload test data
 testdata.fill_test_data(shard)
diff --git a/test/shard_no_redundancy/shard_compound_index.result b/test/shard_no_redundancy/shard_compound_index.result
new file mode 100644
index 0000000..7c84e8a
--- /dev/null
+++ b/test/shard_no_redundancy/shard_compound_index.result
@@ -0,0 +1,1296 @@
+env = require('test_run')
+---
+...
+test_run = env.new()
+---
+...
+shard = require('shard')
+---
+...
+test_run:cmd("setopt delimiter ';'")
+---
+- true
+...
+SERVERS = {'shard1', 'shard2'};
+---
+...
+init_shard(SERVERS, {
+    servers = {
+        { uri = instance_uri('1'), zone = '0' },
+        { uri = instance_uri('2'), zone = '1' },
+    },
+    login = 'guest',
+    password = '',
+    redundancy = 1,
+}, 'shard_no_redundancy');
+---
+...
+test_run:cmd("setopt delimiter ''");
+---
+- true
+...
+fio = require('fio')
+---
+...
+-- require in-repo version of graphql/ sources despite current working directory
+package.path = fio.abspath(debug.getinfo(1).source:match("@?(.*/)"):gsub('/./', '/'):gsub('/+$', '')) .. '/../../?.lua' .. ';' .. package.path
+---
+...
+graphql = require('graphql')
+---
+...
+testdata = require('test.testdata.compound_index_testdata')
+---
+...
+-- init box, upload test data and acquire metadata
+-- -----------------------------------------------
+-- init box and data schema
+test_run:cmd('switch shard1')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch shard2')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch default')
+---
+- true
+...
+shard.reload_schema()
+---
+...
+-- upload test data
+testdata.fill_test_data(shard)
+---
+...
+-- acquire metadata
+metadata = testdata.get_test_metadata()
+---
+...
+schemas = metadata.schemas
+---
+...
+collections = metadata.collections
+---
+...
+service_fields = metadata.service_fields
+---
+...
+indexes = metadata.indexes
+---
+...
+-- build accessor and graphql schemas
+-- ----------------------------------
+test_run:cmd("setopt delimiter ';'")
+---
+- true
+...
+accessor = graphql.accessor_shard.new({
+    schemas = schemas,
+    collections = collections,
+    service_fields = service_fields,
+    indexes = indexes,
+});
+---
+...
+gql_wrapper = graphql.new({
+    schemas = schemas,
+    collections = collections,
+    accessor = accessor,
+});
+---
+...
+test_run:cmd("setopt delimiter ''");
+---
+- true
+...
+testdata.run_queries(gql_wrapper)
+---
+- |+
+  RUN 1_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  ...
+
+  }}}
+
+  RUN 1_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  first_name: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 1_3 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name a
+    user_str: user_str_a
+    first_name: first name a
+    user_num: 12
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 12
+  - last_name: last name d
+    user_str: user_str_d
+    first_name: first name d
+    user_num: 12
+  - last_name: last name e
+    user_str: user_str_e
+    first_name: first name e
+    user_num: 12
+  ...
+
+  }}}
+
+  RUN 1_4 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 1
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 2
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 3
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 4
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 5
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 6
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 7
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 8
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 9
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 10
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 11
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 13
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 14
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 15
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 16
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 17
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 18
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 19
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 20
+  ...
+
+  }}}
+
+  RUN 1_5 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  first_name: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 1_6 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  first_name: non-existent
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 2_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long, $description: String) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(description: $description) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection:
+    - order_num: 1201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1209
+      order_str: order_str_b_9
+      description: description b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 2_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long, $description: String) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(description: $description) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  description: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection: []
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 3 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_str_connection {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+    order_str_connection:
+    - order_num: 101
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 110
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 102
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 103
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 104
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 105
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 106
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 107
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 108
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 301
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 310
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 302
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 305
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 308
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 401
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 410
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 402
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 405
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 408
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 501
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 510
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 502
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 505
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 508
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 601
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 610
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 602
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 605
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 608
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 701
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 710
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 702
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 705
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 708
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 801
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 810
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 802
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 805
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 808
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 901
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 910
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 902
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 905
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 908
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1001
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1010
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1002
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1005
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1008
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1101
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1110
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1102
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1105
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1108
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1301
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1310
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1302
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1305
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1308
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1401
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1410
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1402
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1405
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1408
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1501
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1510
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1502
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1505
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1508
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1601
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1610
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1602
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1605
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1608
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1701
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1710
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1702
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1705
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1708
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1801
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1810
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1802
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1805
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1808
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1901
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1910
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1902
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1905
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1908
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 2001
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 2010
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 2002
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 2005
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 2008
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 109
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 209
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 303
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 304
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 306
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 307
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 309
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 403
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 404
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 406
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 407
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 409
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 503
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 504
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 506
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 507
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 509
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 603
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 604
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 606
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 607
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 609
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 703
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 704
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 706
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 707
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 709
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 803
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 804
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 806
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 807
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 809
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 903
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 904
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 906
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 907
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 909
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1003
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1004
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1006
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1007
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1009
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1103
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1104
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1106
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1107
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1109
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1209
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1303
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1304
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1306
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1307
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1309
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1403
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1404
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1406
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1407
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1409
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1503
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1504
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1506
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1507
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1509
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1603
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1604
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1606
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1607
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1609
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1703
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1704
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1706
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1707
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1709
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1803
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1804
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1806
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1807
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1809
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1903
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1904
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1906
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1907
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1909
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 2003
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 2004
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 2006
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 2007
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 2009
+      order_str: order_str_b_9
+      description: description b
+  ...
+
+  }}}
+
+  RUN 4_1 {{{
+  QUERY
+          query users($limit: Int, $offset: user_collection_offset) {
+              user_collection(limit: $limit, offset: $offset) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    user_num: 12
+    user_str: user_str_b
+  limit: 10
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 13
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 14
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 15
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 16
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 17
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 18
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 19
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 20
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 1
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 2
+  ...
+
+  }}}
+
+  RUN 4_2 {{{
+  QUERY
+          query users($limit: Int, $offset: user_collection_offset) {
+              user_collection(limit: $limit, offset: $offset) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    user_str: user_str_b
+  limit: 10
+  ...
+
+  RESULT
+  ---
+  ok: false
+  err: offset by a partial key is forbidden
+  ...
+
+  }}}
+
+  RUN 5_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $limit: Int, $offset: order_collection_offset) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(limit: $limit, offset: $offset) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    order_num: 1202
+    order_str: order_str_b_2
+  user_str: user_str_b
+  limit: 4
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection:
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 5_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $limit: Int, $offset: order_collection_offset) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(limit: $limit, offset: $offset) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    order_str: order_str_b_2
+  user_str: user_str_b
+  limit: 4
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  ok: false
+  err: 'offset by a partial key is forbidden: expected "order_num" field'
+  ...
+
+  }}}
+
+...
+-- clean up
+-- --------
+test_run:cmd('switch shard1')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch shard2')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch default')
+---
+- true
+...
+test_run:drop_cluster(SERVERS)
+---
+...
diff --git a/test/shard_no_redundancy/shard_compound_index.test.lua b/test/shard_no_redundancy/shard_compound_index.test.lua
new file mode 100644
index 0000000..1be9988
--- /dev/null
+++ b/test/shard_no_redundancy/shard_compound_index.test.lua
@@ -0,0 +1,77 @@
+env = require('test_run')
+test_run = env.new()
+
+shard = require('shard')
+
+test_run:cmd("setopt delimiter ';'")
+SERVERS = {'shard1', 'shard2'};
+init_shard(SERVERS, {
+    servers = {
+        { uri = instance_uri('1'), zone = '0' },
+        { uri = instance_uri('2'), zone = '1' },
+    },
+    login = 'guest',
+    password = '',
+    redundancy = 1,
+}, 'shard_no_redundancy');
+test_run:cmd("setopt delimiter ''");
+
+fio = require('fio')
+
+-- require in-repo version of graphql/ sources despite current working directory
+package.path = fio.abspath(debug.getinfo(1).source:match("@?(.*/)"):gsub('/./', '/'):gsub('/+$', '')) .. '/../../?.lua' .. ';' .. package.path
+
+graphql = require('graphql')
+testdata = require('test.testdata.compound_index_testdata')
+
+-- init box, upload test data and acquire metadata
+-- -----------------------------------------------
+
+-- init box and data schema
+test_run:cmd('switch shard1')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch shard2')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch default')
+shard.reload_schema()
+
+-- upload test data
+testdata.fill_test_data(shard)
+
+-- acquire metadata
+metadata = testdata.get_test_metadata()
+schemas = metadata.schemas
+collections = metadata.collections
+service_fields = metadata.service_fields
+indexes = metadata.indexes
+
+-- build accessor and graphql schemas
+-- ----------------------------------
+
+test_run:cmd("setopt delimiter ';'")
+accessor = graphql.accessor_shard.new({
+    schemas = schemas,
+    collections = collections,
+    service_fields = service_fields,
+    indexes = indexes,
+});
+
+gql_wrapper = graphql.new({
+    schemas = schemas,
+    collections = collections,
+    accessor = accessor,
+});
+test_run:cmd("setopt delimiter ''");
+
+testdata.run_queries(gql_wrapper)
+
+-- clean up
+-- --------
+
+test_run:cmd('switch shard1')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch shard2')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch default')
+
+test_run:drop_cluster(SERVERS)
diff --git a/test/shard_redundancy/no_duplicates.result b/test/shard_redundancy/no_duplicates.result
index ab92449..a161f1a 100644
--- a/test/shard_redundancy/no_duplicates.result
+++ b/test/shard_redundancy/no_duplicates.result
@@ -81,6 +81,9 @@ test_run:cmd('switch default')
 ---
 - true
 ...
+shard.reload_schema()
+---
+...
 -- upload test data
 testdata.fill_test_data(shard)
 ---
diff --git a/test/shard_redundancy/no_duplicates.test.lua b/test/shard_redundancy/no_duplicates.test.lua
index 4b6a1a1..caa631a 100644
--- a/test/shard_redundancy/no_duplicates.test.lua
+++ b/test/shard_redundancy/no_duplicates.test.lua
@@ -42,6 +42,7 @@ require('test.testdata.common_testdata').init_spaces()
 test_run:cmd('switch shard4')
 require('test.testdata.common_testdata').init_spaces()
 test_run:cmd('switch default')
+shard.reload_schema()
 
 -- upload test data
 testdata.fill_test_data(shard)
diff --git a/test/shard_redundancy/nullable_index.result b/test/shard_redundancy/nullable_index.result
index 3ba91ed..40f35d2 100644
--- a/test/shard_redundancy/nullable_index.result
+++ b/test/shard_redundancy/nullable_index.result
@@ -84,6 +84,9 @@ test_run:cmd('switch default')
 ---
 - true
 ...
+shard.reload_schema()
+---
+...
 -- upload test data
 testdata.fill_test_data(shard)
 ---
diff --git a/test/shard_redundancy/nullable_index.test.lua b/test/shard_redundancy/nullable_index.test.lua
index 14a71ed..195aece 100644
--- a/test/shard_redundancy/nullable_index.test.lua
+++ b/test/shard_redundancy/nullable_index.test.lua
@@ -46,6 +46,7 @@ require('test.testdata.nullable_index_testdata').init_spaces()
 test_run:cmd('switch shard4')
 require('test.testdata.nullable_index_testdata').init_spaces()
 test_run:cmd('switch default')
+shard.reload_schema()
 
 -- upload test data
 testdata.fill_test_data(shard)
diff --git a/test/shard_redundancy/shard_compound_index.result b/test/shard_redundancy/shard_compound_index.result
new file mode 100644
index 0000000..92a11ae
--- /dev/null
+++ b/test/shard_redundancy/shard_compound_index.result
@@ -0,0 +1,1328 @@
+env = require('test_run')
+---
+...
+test_run = env.new()
+---
+...
+shard = require('shard')
+---
+...
+-- we need at least four servers to make sure we have several (two) servers
+-- within each replica set and several (two) replica sets
+test_run:cmd("setopt delimiter ';'")
+---
+- true
+...
+SERVERS = {'shard1', 'shard2', 'shard3', 'shard4'};
+---
+...
+init_shard(SERVERS, {
+    servers = {
+        { uri = instance_uri('1'), zone = '0' },
+        { uri = instance_uri('2'), zone = '1' },
+        { uri = instance_uri('3'), zone = '2' },
+        { uri = instance_uri('4'), zone = '3' },
+    },
+    login = 'guest',
+    password = '',
+    redundancy = 2,
+}, 'shard_redundancy');
+---
+...
+test_run:cmd("setopt delimiter ''");
+---
+- true
+...
+fio = require('fio')
+---
+...
+-- require in-repo version of graphql/ sources despite current working directory
+package.path = fio.abspath(debug.getinfo(1).source:match("@?(.*/)"):gsub('/./', '/'):gsub('/+$', '')) .. '/../../?.lua' .. ';' .. package.path
+---
+...
+graphql = require('graphql')
+---
+...
+testdata = require('test.testdata.compound_index_testdata')
+---
+...
+-- init box, upload test data and acquire metadata
+-- -----------------------------------------------
+-- init box and data schema
+test_run:cmd('switch shard1')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch shard2')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch shard3')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch shard4')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').init_spaces()
+---
+...
+test_run:cmd('switch default')
+---
+- true
+...
+-- upload test data
+testdata.fill_test_data(shard)
+---
+...
+shard.reload_schema()
+---
+...
+-- acquire metadata
+metadata = testdata.get_test_metadata()
+---
+...
+schemas = metadata.schemas
+---
+...
+collections = metadata.collections
+---
+...
+service_fields = metadata.service_fields
+---
+...
+indexes = metadata.indexes
+---
+...
+-- build accessor and graphql schemas
+-- ----------------------------------
+test_run:cmd("setopt delimiter ';'")
+---
+- true
+...
+accessor = graphql.accessor_shard.new({
+    schemas = schemas,
+    collections = collections,
+    service_fields = service_fields,
+    indexes = indexes,
+});
+---
+...
+gql_wrapper = graphql.new({
+    schemas = schemas,
+    collections = collections,
+    accessor = accessor,
+});
+---
+...
+test_run:cmd("setopt delimiter ''");
+---
+- true
+...
+testdata.run_queries(gql_wrapper)
+---
+- |+
+  RUN 1_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  ...
+
+  }}}
+
+  RUN 1_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  first_name: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 1_3 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name a
+    user_str: user_str_a
+    first_name: first name a
+    user_num: 12
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 12
+  - last_name: last name d
+    user_str: user_str_d
+    first_name: first name d
+    user_num: 12
+  - last_name: last name e
+    user_str: user_str_e
+    first_name: first name e
+    user_num: 12
+  ...
+
+  }}}
+
+  RUN 1_4 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 1
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 2
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 3
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 4
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 5
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 6
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 7
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 8
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 9
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 10
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 11
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 13
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 14
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 15
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 16
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 17
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 18
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 19
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 20
+  ...
+
+  }}}
+
+  RUN 1_5 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  first_name: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 1_6 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $first_name: String) {
+              user_collection(user_str: $user_str, user_num: $user_num
+                      first_name: $first_name) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  first_name: non-existent
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection: []
+  ...
+
+  }}}
+
+  RUN 2_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long, $description: String) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(description: $description) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection:
+    - order_num: 1201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1209
+      order_str: order_str_b_9
+      description: description b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 2_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long, $description: String) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(description: $description) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_str: user_str_b
+  description: non-existent
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection: []
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 3 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_str_connection {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  user_num: 12
+  user_str: user_str_b
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+    order_str_connection:
+    - order_num: 101
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 110
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 102
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 103
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 104
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 105
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 106
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 107
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 108
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 301
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 310
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 302
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 305
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 308
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 401
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 410
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 402
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 405
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 408
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 501
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 510
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 502
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 505
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 508
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 601
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 610
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 602
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 605
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 608
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 701
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 710
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 702
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 705
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 708
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 801
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 810
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 802
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 805
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 808
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 901
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 910
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 902
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 905
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 908
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1001
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1010
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1002
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1005
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1008
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1101
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1110
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1102
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1105
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1108
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1201
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1210
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1202
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1208
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1301
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1310
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1302
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1305
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1308
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1401
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1410
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1402
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1405
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1408
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1501
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1510
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1502
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1505
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1508
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1601
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1610
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1602
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1605
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1608
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1701
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1710
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1702
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1705
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1708
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1801
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1810
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1802
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1805
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1808
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 1901
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 1910
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 1902
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 1905
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1908
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 2001
+      order_str: order_str_b_1
+      description: description b
+    - order_num: 2010
+      order_str: order_str_b_10
+      description: description b
+    - order_num: 2002
+      order_str: order_str_b_2
+      description: description b
+    - order_num: 2005
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 2008
+      order_str: order_str_b_8
+      description: description b
+    - order_num: 109
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 209
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 303
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 304
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 306
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 307
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 309
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 403
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 404
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 406
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 407
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 409
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 503
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 504
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 506
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 507
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 509
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 603
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 604
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 606
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 607
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 609
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 703
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 704
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 706
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 707
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 709
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 803
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 804
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 806
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 807
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 809
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 903
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 904
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 906
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 907
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 909
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1003
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1004
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1006
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1007
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1009
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1103
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1104
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1106
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1107
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1109
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1207
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1209
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1303
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1304
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1306
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1307
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1309
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1403
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1404
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1406
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1407
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1409
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1503
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1504
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1506
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1507
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1509
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1603
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1604
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1606
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1607
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1609
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1703
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1704
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1706
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1707
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1709
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1803
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1804
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1806
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1807
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1809
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 1903
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1904
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1906
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 1907
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 1909
+      order_str: order_str_b_9
+      description: description b
+    - order_num: 2003
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 2004
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 2006
+      order_str: order_str_b_6
+      description: description b
+    - order_num: 2007
+      order_str: order_str_b_7
+      description: description b
+    - order_num: 2009
+      order_str: order_str_b_9
+      description: description b
+  ...
+
+  }}}
+
+  RUN 4_1 {{{
+  QUERY
+          query users($limit: Int, $offset: user_collection_offset) {
+              user_collection(limit: $limit, offset: $offset) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    user_num: 12
+    user_str: user_str_b
+  limit: 10
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 13
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 14
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 15
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 16
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 17
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 18
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 19
+  - last_name: last name b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 20
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 1
+  - last_name: last name c
+    user_str: user_str_c
+    first_name: first name c
+    user_num: 2
+  ...
+
+  }}}
+
+  RUN 4_2 {{{
+  QUERY
+          query users($limit: Int, $offset: user_collection_offset) {
+              user_collection(limit: $limit, offset: $offset) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    user_str: user_str_b
+  limit: 10
+  ...
+
+  RESULT
+  ---
+  ok: false
+  err: offset by a partial key is forbidden
+  ...
+
+  }}}
+
+  RUN 5_1 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $limit: Int, $offset: order_collection_offset) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(limit: $limit, offset: $offset) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    order_num: 1202
+    order_str: order_str_b_2
+  user_str: user_str_b
+  limit: 4
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  user_collection:
+  - order_connection:
+    - order_num: 1203
+      order_str: order_str_b_3
+      description: description b
+    - order_num: 1204
+      order_str: order_str_b_4
+      description: description b
+    - order_num: 1205
+      order_str: order_str_b_5
+      description: description b
+    - order_num: 1206
+      order_str: order_str_b_6
+      description: description b
+    user_str: user_str_b
+    first_name: first name b
+    user_num: 12
+    last_name: last name b
+  ...
+
+  }}}
+
+  RUN 5_2 {{{
+  QUERY
+          query users($user_str: String, $user_num: Long,
+                  $limit: Int, $offset: order_collection_offset) {
+              user_collection(user_str: $user_str, user_num: $user_num) {
+                  user_str
+                  user_num
+                  last_name
+                  first_name
+                  order_connection(limit: $limit, offset: $offset) {
+                      order_str
+                      order_num
+                      description
+                  }
+              }
+          }
+  VARIABLES
+  ---
+  offset:
+    order_str: order_str_b_2
+  user_str: user_str_b
+  limit: 4
+  user_num: 12
+  ...
+
+  RESULT
+  ---
+  ok: false
+  err: 'offset by a partial key is forbidden: expected "order_num" field'
+  ...
+
+  }}}
+
+...
+-- clean up
+-- --------
+test_run:cmd('switch shard1')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch shard2')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch shard3')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch shard4')
+---
+- true
+...
+require('test.testdata.compound_index_testdata').drop_spaces()
+---
+...
+test_run:cmd('switch default')
+---
+- true
+...
+test_run:drop_cluster(SERVERS)
+---
+...
diff --git a/test/shard_redundancy/shard_compound_index.test.lua b/test/shard_redundancy/shard_compound_index.test.lua
new file mode 100644
index 0000000..25e179b
--- /dev/null
+++ b/test/shard_redundancy/shard_compound_index.test.lua
@@ -0,0 +1,90 @@
+env = require('test_run')
+test_run = env.new()
+
+shard = require('shard')
+
+-- we need at least four servers to make sure we have several (two) servers
+-- within each replica set and several (two) replica sets
+
+test_run:cmd("setopt delimiter ';'")
+SERVERS = {'shard1', 'shard2', 'shard3', 'shard4'};
+init_shard(SERVERS, {
+    servers = {
+        { uri = instance_uri('1'), zone = '0' },
+        { uri = instance_uri('2'), zone = '1' },
+        { uri = instance_uri('3'), zone = '2' },
+        { uri = instance_uri('4'), zone = '3' },
+    },
+    login = 'guest',
+    password = '',
+    redundancy = 2,
+}, 'shard_redundancy');
+test_run:cmd("setopt delimiter ''");
+
+fio = require('fio')
+
+-- require in-repo version of graphql/ sources despite current working directory
+package.path = fio.abspath(debug.getinfo(1).source:match("@?(.*/)"):gsub('/./', '/'):gsub('/+$', '')) .. '/../../?.lua' .. ';' .. package.path
+
+graphql = require('graphql')
+testdata = require('test.testdata.compound_index_testdata')
+
+-- init box, upload test data and acquire metadata
+-- -----------------------------------------------
+
+-- init box and data schema
+test_run:cmd('switch shard1')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch shard2')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch shard3')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch shard4')
+require('test.testdata.compound_index_testdata').init_spaces()
+test_run:cmd('switch default')
+
+-- upload test data
+testdata.fill_test_data(shard)
+shard.reload_schema()
+
+-- acquire metadata
+metadata = testdata.get_test_metadata()
+schemas = metadata.schemas
+collections = metadata.collections
+service_fields = metadata.service_fields
+indexes = metadata.indexes
+
+-- build accessor and graphql schemas
+-- ----------------------------------
+
+test_run:cmd("setopt delimiter ';'")
+accessor = graphql.accessor_shard.new({
+    schemas = schemas,
+    collections = collections,
+    service_fields = service_fields,
+    indexes = indexes,
+});
+
+gql_wrapper = graphql.new({
+    schemas = schemas,
+    collections = collections,
+    accessor = accessor,
+});
+test_run:cmd("setopt delimiter ''");
+
+testdata.run_queries(gql_wrapper)
+
+-- clean up
+-- --------
+
+test_run:cmd('switch shard1')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch shard2')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch shard3')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch shard4')
+require('test.testdata.compound_index_testdata').drop_spaces()
+test_run:cmd('switch default')
+
+test_run:drop_cluster(SERVERS)
diff --git a/test/shard_servers/master.lua b/test/shard_servers/master.lua
index a6579dc..a730010 100644
--- a/test/shard_servers/master.lua
+++ b/test/shard_servers/master.lua
@@ -1,5 +1,7 @@
 #!/usr/bin/env tarantool
 
+local shard_initialized = false
+
 box.cfg({
     listen = os.getenv('LISTEN'),
 })
@@ -15,9 +17,10 @@ function init_shard(servers, config, suite)
     local test_run = env.new()
 
     test_run:create_cluster(servers, suite)
-    box.once('init_shard_module', function()
+    if not shard_initialized then
         shard.init(config)
-    end)
+        shard_initialized = true
+    end
     shard.wait_connection()
 end
 
diff --git a/test/testdata/compound_index_testdata.lua b/test/testdata/compound_index_testdata.lua
index e87d4d0..0117931 100644
--- a/test/testdata/compound_index_testdata.lua
+++ b/test/testdata/compound_index_testdata.lua
@@ -14,6 +14,11 @@ local function print_and_return(...)
     return table.concat({...}, ' ') .. '\n'
 end
 
+local function format_result(name, query, variables, result)
+    return ('RUN %s {{{\nQUERY\n%s\nVARIABLES\n%s\nRESULT\n%s\n}}}\n'):format(
+        name, query:rstrip(), yaml.encode(variables), yaml.encode(result))
+end
+
 -- schemas and meta-information
 -- ----------------------------
 
@@ -201,8 +206,10 @@ function compound_index_testdata.run_queries(gql_wrapper)
     -- -----------------------------------------------------
 
     local query_1 = [[
-        query users($user_str: String, $user_num: Long) {
-            user_collection(user_str: $user_str, user_num: $user_num) {
+        query users($user_str: String, $user_num: Long,
+                $first_name: String) {
+            user_collection(user_str: $user_str, user_num: $user_num
+                    first_name: $first_name) {
                 user_str
                 user_num
                 last_name
@@ -216,8 +223,22 @@ function compound_index_testdata.run_queries(gql_wrapper)
     utils.show_trace(function()
         local variables_1_1 = {user_str = 'user_str_b', user_num = 12}
         local result = gql_query_1:execute(variables_1_1)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '1_1', query_1, variables_1_1, result))
+    end)
+
+    -- get a top-level object by a full compound primary key plus filter
+    -- -----------------------------------------------------------------
+
+    utils.show_trace(function()
+        local variables_1_2 = {
+            user_str = 'user_str_b',
+            user_num = 12,
+            first_name = 'non-existent',
+        }
+        local result = gql_query_1:execute(variables_1_2)
+        results = results .. print_and_return(format_result(
+            '1_2', query_1, variables_1_2, result))
     end)
 
     -- select top-level objects by a partial compound primary key (or maybe use
@@ -225,23 +246,54 @@ function compound_index_testdata.run_queries(gql_wrapper)
     -- ------------------------------------------------------------------------
 
     utils.show_trace(function()
-        local variables_1_2 = {user_num = 12}
-        local result = gql_query_1:execute(variables_1_2)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        local variables_1_3 = {user_num = 12}
+        local result = gql_query_1:execute(variables_1_3)
+        results = results .. print_and_return(format_result(
+            '1_3', query_1, variables_1_3, result))
+    end)
+
+    utils.show_trace(function()
+        local variables_1_4 = {user_str = 'user_str_b'}
+        local result = gql_query_1:execute(variables_1_4)
+        results = results .. print_and_return(format_result(
+            '1_4', query_1, variables_1_4, result))
+    end)
+
+    -- select top-level objects by a partial compound primary key plus filter
+    -- (or maybe use fullscan)
+    -- ----------------------------------------------------------------------
+
+    utils.show_trace(function()
+        local variables_1_5 = {
+            user_num = 12,
+            first_name = 'non-existent'
+        }
+        local result = gql_query_1:execute(variables_1_5)
+        results = results .. print_and_return(format_result(
+            '1_5', query_1, variables_1_5, result))
+    end)
+
+    utils.show_trace(function()
+        local variables_1_6 = {
+            user_str = 'user_str_b',
+            first_name = 'non-existent'
+        }
+        local result = gql_query_1:execute(variables_1_6)
+        results = results .. print_and_return(format_result(
+            '1_6', query_1, variables_1_6, result))
     end)
 
     -- select objects by a connection by a full compound index
     -- -------------------------------------------------------
 
     local query_2 = [[
-        query users($user_str: String, $user_num: Long) {
+        query users($user_str: String, $user_num: Long, $description: String) {
             user_collection(user_str: $user_str, user_num: $user_num) {
                 user_str
                 user_num
                 last_name
                 first_name
-                order_connection {
+                order_connection(description: $description) {
                     order_str
                     order_num
                     description
@@ -250,12 +302,27 @@ function compound_index_testdata.run_queries(gql_wrapper)
         }
     ]]
 
+    local gql_query_2 = gql_wrapper:compile(query_2)
+
+    utils.show_trace(function()
+        local variables_2_1 = {user_str = 'user_str_b', user_num = 12}
+        local result = gql_query_2:execute(variables_2_1)
+        results = results .. print_and_return(format_result(
+            '2_1', query_2, variables_2_1, result))
+    end)
+
+    -- select objects by a connection by a full compound index plus filter
+    -- -------------------------------------------------------------------
+
     utils.show_trace(function()
-        local gql_query_2 = gql_wrapper:compile(query_2)
-        local variables_2 = {user_str = 'user_str_b', user_num = 12}
-        local result = gql_query_2:execute(variables_2)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        local variables_2_2 = {
+            user_str = 'user_str_b',
+            user_num = 12,
+            description = 'non-existent',
+        }
+        local result = gql_query_2:execute(variables_2_2)
+        results = results .. print_and_return(format_result(
+            '2_2', query_2, variables_2_2, result))
     end)
 
     -- select object by a connection by a partial compound index
@@ -281,8 +348,8 @@ function compound_index_testdata.run_queries(gql_wrapper)
         local gql_query_3 = gql_wrapper:compile(query_3)
         local variables_3 = {user_str = 'user_str_b', user_num = 12}
         local result = gql_query_3:execute(variables_3)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '3', query_3, variables_3, result))
     end)
 
     -- offset on top-level by a full compound primary key
@@ -310,27 +377,28 @@ function compound_index_testdata.run_queries(gql_wrapper)
             }
         }
         local result = gql_query_4:execute(variables_4_1)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '4_1', query_4, variables_4_1, result))
     end)
 
     -- offset on top-level by a partial compound primary key (expected to fail)
     -- ------------------------------------------------------------------------
 
-    local ok, err = pcall(function()
-        local variables_4_2 = {
-            limit = 10,
-            offset = {
-                user_str = 'user_str_b',
-            }
+    local variables_4_2 = {
+        limit = 10,
+        offset = {
+            user_str = 'user_str_b',
         }
+    }
+    local ok, err = pcall(function()
         local result = gql_query_4:execute(variables_4_2)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '4_2', query_4, variables_4_2, result))
     end)
 
-    results = results .. print_and_return(
-        ('RESULT: ok: %s; err: %s'):format(tostring(ok), strip_error(err)))
+    local result = {ok = ok, err = strip_error(err)}
+    results = results .. print_and_return(format_result(
+        '4_2', query_4, variables_4_2, result))
 
     -- offset when using a connection by a full compound primary key
     -- -------------------------------------------------------------
@@ -365,30 +433,31 @@ function compound_index_testdata.run_queries(gql_wrapper)
             }
         }
         local result = gql_query_5:execute(variables_5_1)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '5_1', query_5, variables_5_1, result))
     end)
 
     -- offset when using a connection by a partial compound primary key
     -- (expected to fail)
     -- ----------------------------------------------------------------
 
-    local ok, err = pcall(function()
-        local variables_5_2 = {
-            user_str = 'user_str_b',
-            user_num = 12,
-            limit = 4,
-            offset = {
-                order_str = 'order_str_b_2',
-            }
+    local variables_5_2 = {
+        user_str = 'user_str_b',
+        user_num = 12,
+        limit = 4,
+        offset = {
+            order_str = 'order_str_b_2',
         }
+    }
+    local ok, err = pcall(function()
         local result = gql_query_5:execute(variables_5_2)
-        results = results .. print_and_return(
-            ('RESULT\n%s'):format(yaml.encode(result)))
+        results = results .. print_and_return(format_result(
+            '5_2', query_5, variables_5_2, result))
     end)
 
-    results = results .. print_and_return(
-        ('RESULT: ok: %s; err: %s'):format(tostring(ok), strip_error(err)))
+    local result = {ok = ok, err = strip_error(err)}
+    results = results .. print_and_return(format_result(
+        '5_2', query_5, variables_5_2, result))
 
     return results
 end