parser: support the new sql to show table t1 distribution (#59820)

close #59886

Author: bufferflies

pkg/parser/ast/dml.go

@@ -3050,6 +3050,7 @@ const (
 	ShowCreateProcedure
 	ShowBinlogStatus
 	ShowReplicaStatus
+	ShowDistributions
 )
 
 const (
@@ -3394,6 +3395,16 @@ func (n *ShowStmt) Restore(ctx *format.RestoreCtx) error {
 			ctx.WriteKeyWord("BINDING_CACHE STATUS")
 		case ShowAnalyzeStatus:
 			ctx.WriteKeyWord("ANALYZE STATUS")
+		case ShowDistributions:
+			ctx.WriteKeyWord("TABLE ")
+			if err := n.Table.Restore(ctx); err != nil {
+				return errors.Annotate(err, "An error occurred while restore ShowStmt.Table")
+			}
+			ctx.WriteKeyWord(" DISTRIBUTIONS")
+			if err := restoreShowLikeOrWhereOpt(); err != nil {
+				return err
+			}
+			return nil
 		case ShowRegions:
 			ctx.WriteKeyWord("TABLE ")
 			if err := n.Table.Restore(ctx); err != nil {

pkg/parser/keywords.go

@@ -36,7 +36,7 @@ func TestKeywords(t *testing.T) {
 }
 
 func TestKeywordsLength(t *testing.T) {
-	require.Equal(t, 655, len(parser.Keywords))
+	require.Equal(t, 656, len(parser.Keywords))
 
 	reservedNr := 0
 	for _, kw := range parser.Keywords {

pkg/parser/keywords_test.go

@@ -342,6 +342,7 @@ var tokenMap = map[string]int{
 	"DISK":                     disk,
 	"DISTINCT":                 distinct,
 	"DISTINCTROW":              distinct,
+	"DISTRIBUTIONS":            distributions,
 	"DIV":                      div,
 	"DO":                       do,
 	"DOT":                      dotType,