From 8ad7458738a0bc5247078486c3ec01bae6f6c40a Mon Sep 17 00:00:00 2001
From: Roman Borschel <roman@cluvio.com>
Date: Mon, 31 Mar 2025 15:30:39 +0200
Subject: [PATCH] Enable double-dot-notation for mssql.

Since the schema name is optional in MSQL table identifiers,
double-dot notation is supported, in which case the default dbo schema
is used.
---
 src/dialect/mssql.rs     | 5 +++++
 tests/sqlparser_mssql.rs | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/src/dialect/mssql.rs b/src/dialect/mssql.rs
index 3db34748e..18a963a4b 100644
--- a/src/dialect/mssql.rs
+++ b/src/dialect/mssql.rs
@@ -101,4 +101,9 @@ impl Dialect for MsSqlDialect {
     fn supports_nested_comments(&self) -> bool {
         true
     }
+
+    /// See <https://learn.microsoft.com/en-us/sql/t-sql/queries/from-transact-sql>
+    fn supports_object_name_double_dot_notation(&self) -> bool {
+        true
+    }
 }
diff --git a/tests/sqlparser_mssql.rs b/tests/sqlparser_mssql.rs
index ca59b164e..2bfc38a6a 100644
--- a/tests/sqlparser_mssql.rs
+++ b/tests/sqlparser_mssql.rs
@@ -1910,6 +1910,11 @@ fn parse_mssql_varbinary_max_length() {
     }
 }
 
+#[test]
+fn parse_mssql_table_identifier_with_default_schema() {
+    ms().verified_stmt("SELECT * FROM mydatabase..MyTable");
+}
+
 fn ms() -> TestedDialects {
     TestedDialects::new(vec![Box::new(MsSqlDialect {})])
 }