Check for multi-db commit failed warning

Signed-off-by: Florent Poinsard <florent.poinsard@outlook.fr>

go/test/endtoend/reparent/newfeaturetest/reparent_in_tx_test.go

@@ -18,6 +18,7 @@ package newfeaturetest
 
 import (
 	"context"
+	"strings"
 	"testing"
 	"time"
 
@@ -49,8 +50,21 @@ func testCommitError(t *testing.T, conn *mysql.Conn, clusterInstance *cluster.Lo
 
 	reparent(t, clusterInstance, tablets, tabletStopped, commitDone)
 
+	// we may run in a situation where we first commit on a healthy shard, in which case we would run in a multi-db commit
+	// warning, in this situation, we cannot proceed with the select asserting that no rows are returned as there will be
+	// commited inserts on healthy shards.
+	r, err := conn.ExecuteFetch("show warnings", 100, false)
+	require.NoError(t, err)
+	for _, row := range r.Rows {
+		if len(row) == 3 && strings.Contains(row[2].ToString(), "mutli-db commit failed") {
+			_, err = conn.ExecuteFetch("delete * from vt_insert_test", 0, false)
+			require.NoError(t, err)
+			return
+		}
+	}
+
 	// if the unhealthy shard is the first one where we commited, let's assert that the table is empty on all the shards
-	r, err := conn.ExecuteFetch("select * from vt_insert_test", 1, false)
+	r, err = conn.ExecuteFetch("select * from vt_insert_test", 1, false)
 	require.NoError(t, err)
 	require.Len(t, r.Rows, 0)
 }