Port QueryEngine

packages/firestore/src/core/query.ts

@@ -19,7 +19,6 @@ import { compareDocumentsByField, Document } from '../model/document';
 import { DocumentKey } from '../model/document_key';
 import { FieldPath, ResourcePath } from '../model/path';
 import { debugAssert, debugCast, fail } from '../util/assert';
-import { isNullOrUndefined } from '../util/types';
 
 import {
   Bound,
@@ -155,7 +154,7 @@ export function asCollectionQueryAtPath(
  * Returns true if this query does not specify any query constraints that
  * could remove results.
  */
-export function matchesAllDocuments(query: Query): boolean {
+export function queryMatchesAllDocuments(query: Query): boolean {
   return (
     query.filters.length === 0 &&
     query.limit === null &&
@@ -167,14 +166,6 @@ export function matchesAllDocuments(query: Query): boolean {
   );
 }
 
-export function hasLimitToFirst(query: Query): boolean {
-  return !isNullOrUndefined(query.limit) && query.limitType === LimitType.First;
-}
-
-export function hasLimitToLast(query: Query): boolean {
-  return !isNullOrUndefined(query.limit) && query.limitType === LimitType.Last;
-}
-
 export function getFirstOrderByField(query: Query): FieldPath | null {
   return query.explicitOrderBy.length > 0
     ? query.explicitOrderBy[0].field
@@ -393,7 +384,7 @@ export function queryWithAddedOrderBy(query: Query, orderBy: OrderBy): Query {
 
 export function queryWithLimit(
   query: Query,
-  limit: number,
+  limit: number | null,
   limitType: LimitType
 ): Query {
   return new QueryImpl(

packages/firestore/src/core/view.ts

@@ -27,13 +27,7 @@ import { DocumentSet } from '../model/document_set';
 import { TargetChange } from '../remote/remote_event';
 import { debugAssert, fail } from '../util/assert';
 
-import {
-  hasLimitToFirst,
-  hasLimitToLast,
-  newQueryComparator,
-  Query,
-  queryMatches
-} from './query';
+import { LimitType, newQueryComparator, Query, queryMatches } from './query';
 import { OnlineState } from './types';
 import {
   ChangeType,
@@ -146,11 +140,13 @@ export class View {
     // Note that this should never get used in a refill (when previousChanges is
     // set), because there will only be adds -- no deletes or updates.
     const lastDocInLimit =
-      hasLimitToFirst(this.query) && oldDocumentSet.size === this.query.limit
+      this.query.limitType === LimitType.First &&
+      oldDocumentSet.size === this.query.limit
         ? oldDocumentSet.last()
         : null;
     const firstDocInLimit =
-      hasLimitToLast(this.query) && oldDocumentSet.size === this.query.limit
+      this.query.limitType === LimitType.Last &&
+      oldDocumentSet.size === this.query.limit
         ? oldDocumentSet.first()
         : null;
 
@@ -228,11 +224,12 @@ export class View {
     });
 
     // Drop documents out to meet limit/limitToLast requirement.
-    if (hasLimitToFirst(this.query) || hasLimitToLast(this.query)) {
+    if (this.query.limit !== null) {
       while (newDocumentSet.size > this.query.limit!) {
-        const oldDoc = hasLimitToFirst(this.query)
-          ? newDocumentSet.last()
-          : newDocumentSet.first();
+        const oldDoc =
+          this.query.limitType === LimitType.First
+            ? newDocumentSet.last()
+            : newDocumentSet.first();
         newDocumentSet = newDocumentSet.delete(oldDoc!.key);
         newMutatedKeys = newMutatedKeys.delete(oldDoc!.key);
         changeSet.track({ type: ChangeType.Removed, doc: oldDoc! });

packages/firestore/src/lite-api/query.ts

@@ -22,7 +22,6 @@ import {
   findFilterOperator,
   getFirstOrderByField,
   getInequalityFilterField,
-  hasLimitToLast,
   isCollectionGroupQuery,
   LimitType,
   Query as InternalQuery,
@@ -66,7 +65,10 @@ import {
 export function validateHasExplicitOrderByForLimitToLast(
   query: InternalQuery
 ): void {
-  if (hasLimitToLast(query) && query.explicitOrderBy.length === 0) {
+  if (
+    query.limitType === LimitType.Last &&
+    query.explicitOrderBy.length === 0
+  ) {
     throw new FirestoreError(
       Code.UNIMPLEMENTED,
       'limitToLast() queries require specifying at least one orderBy() clause'

packages/firestore/src/lite-api/reference_impl.ts

@@ -21,7 +21,7 @@ import {
 } from '@firebase/firestore-types';
 import { getModularInstance } from '@firebase/util';
 
-import { hasLimitToLast } from '../core/query';
+import { LimitType } from '../core/query';
 import { DeleteMutation, Precondition } from '../model/mutation';
 import {
   invokeBatchGetDocumentsRpc,
@@ -172,7 +172,7 @@ export function getDocs<T>(query: Query<T>): Promise<QuerySnapshot<T>> {
         )
     );
 
-    if (hasLimitToLast(query._query)) {
+    if (query._query.limitType === LimitType.Last) {
       // Limit to last queries reverse the orderBy constraint that was
       // specified by the user. As such, we need to reverse the order of the
       // results to return the documents in the expected order.

packages/firestore/src/local/index_manager.ts

@@ -155,4 +155,13 @@ export interface IndexManager {
     transaction: PersistenceTransaction,
     documents: DocumentMap
   ): PersistencePromise<void>;
+
+  /**
+   * Iterates over all field indexes that are used to serve the given target,
+   * and returns the minimum offset of them all.
+   */
+  getMinOffset(
+    transaction: PersistenceTransaction,
+    target: Target
+  ): PersistencePromise<IndexOffset>;
 }

packages/firestore/src/local/indexeddb_index_manager.ts

@@ -44,6 +44,7 @@ import {
   fieldIndexToString,
   IndexKind,
   IndexOffset,
+  indexOffsetComparator,
   IndexSegment
 } from '../model/field_index';
 import { FieldPath, ResourcePath } from '../model/path';
@@ -469,15 +470,22 @@ export class IndexedDbIndexManager implements IndexManager {
     transaction: PersistenceTransaction,
     target: Target
   ): PersistencePromise<IndexType> {
-    // TODO(orqueries): We should look at the subtargets here
-    return this.getFieldIndex(transaction, target).next(index => {
-      if (!index) {
-        return IndexType.NONE as IndexType;
+    let indexType = IndexType.FULL;
+    return PersistencePromise.forEach(
+      this.getSubTargets(target),
+      (target: Target) => {
+        return this.getFieldIndex(transaction, target).next(index => {
+          if (!index) {
+            indexType = IndexType.NONE;
+          } else if (
+            indexType !== IndexType.NONE &&
+            index.fields.length < targetGetSegmentCount(target)
+          ) {
+            indexType = IndexType.PARTIAL;
+          }
+        });
       }
-      return index.fields.length < targetGetSegmentCount(target)
-        ? IndexType.PARTIAL
-        : IndexType.FULL;
-    });
+    ).next(() => indexType);
   }
 
   /**
@@ -972,6 +980,28 @@ export class IndexedDbIndexManager implements IndexManager {
     }
     return ranges;
   }
+
+  getMinOffset(
+    transaction: PersistenceTransaction,
+    target: Target
+  ): PersistencePromise<IndexOffset> {
+    let offset: IndexOffset | undefined;
+    return PersistencePromise.forEach(
+      this.getSubTargets(target),
+      (target: Target) => {
+        return this.getFieldIndex(transaction, target).next(index => {
+          if (!index) {
+            offset = IndexOffset.min();
+          } else if (
+            !offset ||
+            indexOffsetComparator(index.indexState.offset, offset) < 0
+          ) {
+            offset = index.indexState.offset;
+          }
+        });
+      }
+    ).next(() => offset!);
+  }
 }
 
 /**

packages/firestore/src/local/indexeddb_schema.ts

@@ -29,7 +29,7 @@ import { EncodedResourcePath } from './encoded_resource_path';
 import { DbTimestampKey } from './indexeddb_sentinels';
 
 // TODO(indexing): Remove this constant
-const INDEXING_ENABLED = false;
+export const INDEXING_ENABLED = false;
 
 export const INDEXING_SCHEMA_VERSION = 14;
 

packages/firestore/src/local/local_documents_view.ts

@@ -52,7 +52,7 @@ export class LocalDocumentsView {
   constructor(
     readonly remoteDocumentCache: RemoteDocumentCache,
     readonly mutationQueue: MutationQueue,
-    readonly indexManager: IndexManager
+    private readonly indexManager: IndexManager
   ) {}
 
   /**

packages/firestore/src/local/local_store_impl.ts

@@ -203,7 +203,7 @@ class LocalStoreImpl implements LocalStore {
       this.indexManager
     );
     this.remoteDocuments.setIndexManager(this.indexManager);
-    this.queryEngine.setLocalDocumentsView(this.localDocuments);
+    this.queryEngine.initialize(this.localDocuments, this.indexManager);
   }
 
   collectGarbage(garbageCollector: LruGarbageCollector): Promise<LruResults> {

packages/firestore/src/local/memory_index_manager.ts

@@ -97,6 +97,13 @@ export class MemoryIndexManager implements IndexManager {
     return PersistencePromise.resolve<string | null>(null);
   }
 
+  getMinOffset(
+    transaction: PersistenceTransaction,
+    target: Target
+  ): PersistencePromise<IndexOffset> {
+    return PersistencePromise.resolve(IndexOffset.min());
+  }
+
   updateCollectionGroup(
     transaction: PersistenceTransaction,
     collectionGroup: string,