Fix computed columns mapping to wrong tables (#51009)

Co-authored-by: Shawn Tunney <[email protected]>

src/Illuminate/Database/Schema/Grammars/SqlServerGrammar.php

@@ -125,7 +125,7 @@ public function compileColumns($schema, $table)
             .'join sys.schemas as scm on obj.schema_id = scm.schema_id '
             .'left join sys.default_constraints def on col.default_object_id = def.object_id and col.object_id = def.parent_object_id '
             ."left join sys.extended_properties as prop on obj.object_id = prop.major_id and col.column_id = prop.minor_id and prop.name = 'MS_Description' "
-            .'left join sys.computed_columns as com on col.column_id = com.column_id '
+            .'left join sys.computed_columns as com on col.column_id = com.column_id and col.object_id = com.object_id '
             ."where obj.type in ('U', 'V') and obj.name = %s and scm.name = %s "
             .'order by col.column_id',
             $this->quoteString($table),

tests/Integration/Database/SqlServer/DatabaseSqlServerSchemaBuilderTest.php

@@ -21,6 +21,7 @@ protected function afterRefreshingDatabase()
     protected function destroyDatabaseMigrations()
     {
         Schema::drop('users');
+        Schema::dropIfExists('computed');
         DB::statement('drop view if exists users_view');
     }
 
@@ -64,4 +65,12 @@ public function testGetViewsWhenNoneExist()
     {
         $this->assertSame([], Schema::getViews());
     }
+
+    public function testComputedColumnsListing()
+    {
+        DB::statement('create table dbo.computed (id int identity (1,1) not null, computed as id + 1)');
+
+        $userColumns = Schema::getColumns('users');
+        $this->assertNull($userColumns[1]['generation']);
+    }
 }