func TestParallelDropCreateTables(t *testing.T) {
	defer leaktest.AfterTest(t)()

	// This number has to be around 10 or else testrace will take too long to
	// finish.
	const numberOfNodes = 3
	const workers = 60
	const repeat = 1000

	tc := testcluster.StartTestCluster(t, numberOfNodes, base.TestClusterArgs{})
	defer tc.Stopper().Stop(context.TODO())

	if _, err := tc.ServerConn(0).Exec(`CREATE DATABASE "test"`); err != nil {
		t.Fatal(err)
	}

	var wgStart sync.WaitGroup
	var wgEnd sync.WaitGroup
	wgStart.Add(workers)
	wgEnd.Add(workers)
	signal := make(chan struct{})
	for i := 0; i < workers; i++ {
		db := tc.ServerConn(i % numberOfNodes)
		go createTestTable2(t, tc, i, repeat, db, &wgStart, &wgEnd, signal)
	}

	// Wait until all goroutines are ready.
	wgStart.Wait()
	// Signal the create table goroutines to start.
	close(signal)
	// Wait until all create tables are finished.
	wgEnd.Wait()

}
func createTestTable2(
	t *testing.T,
	tc *testcluster.TestCluster,
	id int,
	repeat int,
	db *gosql.DB,
	wgStart *sync.WaitGroup,
	wgEnd *sync.WaitGroup,
	signal chan struct{},
) {
	defer wgEnd.Done()

	wgStart.Done()
	<-signal

	for i := 0; i < repeat; i++ {
		log.Infof(context.TODO(), "!!! worker %d loop %d", id, i)
		tableName := fmt.Sprintf("%d_%d", id, i)
		tableSQL := fmt.Sprintf(`
		CREATE TABLE "test"."table_%s" (
			id INT PRIMARY KEY,
			val INT
		)`, tableName)
		// if i%2 == 0 {
		//   txn, err := db.Begin()
		//   if err != nil {
		//     t.Errorf("table %d: could not be created. begin err: %s", id, err)
		//     panic("!!!")
		//     return
		//   }
		//   if _, err := txn.Exec(tableSQL); err != nil {
		//     t.Errorf("table %d: could not be created: %s", id, err)
		//     panic("!!!")
		//     return
		//   }
		//   if err := txn.Commit(); err != nil {
		//     t.Errorf("table %d: could not be created. commit err: %s", id, err)
		//     panic("!!!")
		//     return
		//   }
		// } else {
		if _, err := db.Exec(tableSQL); err != nil {
			t.Errorf("table %d: could not be created: %s", id, err)
			return
		}
		// }
	}
}