Check that db is selected before loading babelfishpg_tsql (#223)

* Check that db is selected before loading babelfishpg_tsql

Signed-off-by: Alex Kasko <[email protected]>

.github/workflows/main.yml

@@ -11,13 +11,17 @@ jobs:
     steps:
       - name: clone-repository
         uses: actions/checkout@v2
+      - name: install-dependencies
+        run: |
+          sudo apt update --fix-missing -y
+          sudo apt install -y libipc-run-perl
       - name: build-postgres
         run: |
-          ./configure
-          make world-bin -j8 COPT='-Werror'
+          ./configure --with-icu --enable-cassert --enable-tap-tests
+          make world-bin -j8 COPT='-Werror -Wno-error=maybe-uninitialized'
       - name: run-tests
         run: |
-          make check -j8
+          make check-world
       - name: upload-test-summary
         if: failure()
         uses: actions/upload-artifact@v2

src/backend/tcop/postgres.c

@@ -4270,7 +4270,7 @@ PostgresMain(const char *dbname, const char *username)
 	 */
 	start_xact_command();
 	PushActiveSnapshot(GetTransactionSnapshot());
-	if (get_extension_oid(pgtsql_library_name, true) != InvalidOid)
+	if (OidIsValid(MyDatabaseId) && OidIsValid(get_extension_oid(pgtsql_library_name, true)))
 	{
 		/*
 		 * babelfishpg_tsql extension depends on babelfishpg_common, so