schemachanger: Skip some reported timeout backup tests

Author: Xiang-Gu

pkg/sql/schemachanger/sctest/backup.go

@@ -35,13 +35,24 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+// TODO (xiang): Fix and unskip those flaky backup tests.
+func skipFlakyBackupTests(t *testing.T, path string) {
+	if strings.Contains(path, "alter_table_multiple_commands") ||
+		strings.Contains(path, "alter_table_alter_primary_key_drop_rowid") ||
+		strings.Contains(path, "drop_column_basic") {
+		skip.WithIssue(t, 108221, "skipping flaky tests")
+	}
+}
+
 // BackupSuccess tests that the schema changer can handle being backed up
 // any time during a successful schema change.
 func BackupSuccess(t *testing.T, path string, factory TestServerFactory) {
 	// These tests are expensive.
 	skip.UnderStress(t)
 	skip.UnderRace(t)
 
+	skipFlakyBackupTests(t, path)
+
 	cumulativeTestForEachPostCommitStage(t, path, factory, func(t *testing.T, cs CumulativeTestCaseSpec) {
 		backupSuccess(t, factory, cs)
 	})
@@ -57,6 +68,8 @@ func BackupRollbacks(t *testing.T, path string, factory TestServerFactory) {
 	// and at least as expensive to run.
 	skip.UnderShort(t)
 
+	skipFlakyBackupTests(t, path)
+
 	cumulativeTestForEachPostCommitStage(t, path, factory, func(t *testing.T, cs CumulativeTestCaseSpec) {
 		backupRollbacks(t, factory, cs)
 	})
@@ -72,6 +85,8 @@ func BackupSuccessMixedVersion(t *testing.T, path string, factory TestServerFact
 	// and at least as expensive to run.
 	skip.UnderShort(t)
 
+	skipFlakyBackupTests(t, path)
+
 	factory = factory.WithMixedVersion()
 	cumulativeTestForEachPostCommitStage(t, path, factory, func(t *testing.T, cs CumulativeTestCaseSpec) {
 		backupSuccess(t, factory, cs)
@@ -88,6 +103,8 @@ func BackupRollbacksMixedVersion(t *testing.T, path string, factory TestServerFa
 	// and at least as expensive to run.
 	skip.UnderShort(t)
 
+	skipFlakyBackupTests(t, path)
+
 	factory = factory.WithMixedVersion()
 	cumulativeTestForEachPostCommitStage(t, path, factory, func(t *testing.T, cs CumulativeTestCaseSpec) {
 		backupRollbacks(t, factory, cs)