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parser: respect TiDB comment when DROP INDEX IF EXISTS #30173

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merged 4 commits into from
Nov 30, 2021
Merged

parser: respect TiDB comment when DROP INDEX IF EXISTS #30173

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f20e4c0
parser: respect TiDB comment when DROP INDEX IF EXISTS
lance6716 Nov 26, 2021
eb37727
address comment
lance6716 Nov 26, 2021
ef0bbf3
fix make fmt
lance6716 Nov 26, 2021
8b2618c
Merge branch 'master' into drop-index-comment
glorv Nov 30, 2021
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5 changes: 4 additions & 1 deletion parser/ast/ddl.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ package ast

import (
"github.com/pingcap/errors"

"github.com/pingcap/tidb/parser/auth"
"github.com/pingcap/tidb/parser/format"
"github.com/pingcap/tidb/parser/model"
Expand Down Expand Up @@ -1689,7 +1690,9 @@ type DropIndexStmt struct {
func (n *DropIndexStmt) Restore(ctx *format.RestoreCtx) error {
ctx.WriteKeyWord("DROP INDEX ")
if n.IfExists {
ctx.WriteKeyWord("IF EXISTS ")
ctx.WriteWithSpecialComments("", func() {
ctx.WriteKeyWord("IF EXISTS ")
})
}
ctx.WriteName(n.IndexName)
ctx.WriteKeyWord(" ON ")
Expand Down
26 changes: 25 additions & 1 deletion parser/ast/ddl_test.go
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Expand Up @@ -16,9 +16,10 @@ package ast_test
import (
"testing"

"github.com/stretchr/testify/require"

. "github.com/pingcap/tidb/parser/ast"
"github.com/pingcap/tidb/parser/format"
"github.com/stretchr/testify/require"
)

func TestDDLVisitorCover(t *testing.T) {
Expand Down Expand Up @@ -623,3 +624,26 @@ func TestSequenceRestore(t *testing.T) {
}
runNodeRestoreTest(t, testCases, "%s", extractNodeFunc)
}

func TestDropIndexRestore(t *testing.T) {
t.Parallel()
sourceSQL := "drop index if exists idx on t"
cases := []struct {
flags format.RestoreFlags
expectSQL string
}{
{format.DefaultRestoreFlags, "DROP INDEX IF EXISTS `idx` ON `t`"},
{format.DefaultRestoreFlags | format.RestoreTiDBSpecialComment, "DROP INDEX /*T! IF EXISTS */`idx` ON `t`"},
}

extractNodeFunc := func(node Node) Node {
return node
}

for _, ca := range cases {
testCases := []NodeRestoreTestCase{
{sourceSQL, ca.expectSQL},
}
runNodeRestoreTestWithFlags(t, testCases, "%s", extractNodeFunc, ca.flags)
}
}