Backport: VTCombo: Ensure VSchema exists when creating keyspace (vitessio#16094)

Signed-off-by: Brendan Dougherty <brendan.dougherty@shopify.com>

Author: brendar

go/test/endtoend/vtcombo/vttest_sample_test.go

@@ -135,6 +135,8 @@ func TestStandalone(t *testing.T) {
 	tmp, _ := cmd.([]any)
 	require.Contains(t, tmp[0], "vtcombo")
 
+	assertVSchemaExists(t, grpcAddress)
+
 	ctx := context.Background()
 	conn, err := vtgateconn.Dial(ctx, grpcAddress)
 	require.NoError(t, err)
@@ -165,6 +167,17 @@ func TestStandalone(t *testing.T) {
 	assertTransactionalityAndRollbackObeyed(ctx, t, conn, idStart)
 }
 
+func assertVSchemaExists(t *testing.T, grpcAddress string) {
+	tmpCmd := exec.Command("vtctldclient", "--server", grpcAddress, "--compact", "GetVSchema", "routed")
+
+	log.Infof("Running vtctldclient with command: %v", tmpCmd.Args)
+
+	output, err := tmpCmd.CombinedOutput()
+	require.NoError(t, err, fmt.Sprintf("Output:\n%v", string(output)))
+
+	assert.Equal(t, "{}\n", string(output))
+}
+
 func assertInsertedRowsExist(ctx context.Context, t *testing.T, conn *vtgateconn.VTGateConn, idStart, rowCount int) {
 	cur := conn.Session(ks1+":-80@rdonly", nil)
 	bindVariables := map[string]*querypb.BindVariable{

go/vt/vtcombo/tablet_map.go

@@ -318,6 +318,11 @@ func CreateKs(
 			return 0, fmt.Errorf("CreateKeyspace(%v) failed: %v", keyspace, err)
 		}
 
+		// make sure a valid vschema has been loaded
+		if err := ts.EnsureVSchema(ctx, keyspace); err != nil {
+			return 0, fmt.Errorf("EnsureVSchema(%v) failed: %v", keyspace, err)
+		}
+
 		// iterate through the shards
 		for _, spb := range kpb.Shards {
 			shard := spb.Name