parser: polish the error message for generated column with default va…

…lue (#43669) close #22535
pingcap · May 11, 2023 · bc98c8d · bc98c8d
1 parent 2e8bc40
commit bc98c8d
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Showing 4 changed files with 30 additions and 17 deletions.
diff --git a/parser/ast/ddl.go b/parser/ast/ddl.go
@@ -525,10 +525,10 @@ const (
 )
 
 var (
-	invalidOptionForGeneratedColumn = map[ColumnOptionType]struct{}{
-		ColumnOptionAutoIncrement: {},
-		ColumnOptionOnUpdate:      {},
-		ColumnOptionDefaultValue:  {},
+	invalidOptionForGeneratedColumn = map[ColumnOptionType]string{
+		ColumnOptionAutoIncrement: "AUTO_INCREMENT",
+		ColumnOptionOnUpdate:      "ON UPDATE",
+		ColumnOptionDefaultValue:  "DEFAULT",
 	}
 )
 
@@ -1007,17 +1007,22 @@ func (n *ColumnDef) Accept(v Visitor) (Node, bool) {
 // For example, generated column definitions that contain such
 // column options as `ON UPDATE`, `AUTO_INCREMENT`, `DEFAULT`
 // are illegal.
-func (n *ColumnDef) Validate() bool {
+func (n *ColumnDef) Validate() error {
 	generatedCol := false
-	illegalOpt4gc := false
+	var illegalOpt4gc string
 	for _, opt := range n.Options {
 		if opt.Tp == ColumnOptionGenerated {
 			generatedCol = true
 		}
-		_, found := invalidOptionForGeneratedColumn[opt.Tp]
-		illegalOpt4gc = illegalOpt4gc || found
+		msg, found := invalidOptionForGeneratedColumn[opt.Tp]
+		if found {
+			illegalOpt4gc = msg
+		}
+	}
+	if generatedCol && illegalOpt4gc != "" {
+		return ErrWrongUsage.GenWithStackByArgs(illegalOpt4gc, "generated column")
 	}
-	return !(generatedCol && illegalOpt4gc)
+	return nil
 }
 
 type TemporaryKeyword int
@@ -3689,6 +3694,7 @@ var (
 	ErrWrongPartitionTypeExpectedSystemTime = terror.ClassDDL.NewStd(mysql.ErrWrongPartitionTypeExpectedSystemTime)
 	ErrUnknownCharacterSet                  = terror.ClassDDL.NewStd(mysql.ErrUnknownCharacterSet)
 	ErrCoalescePartitionNoPartition         = terror.ClassDDL.NewStd(mysql.ErrCoalescePartitionNoPartition)
+	ErrWrongUsage                           = terror.ClassDDL.NewStd(mysql.ErrWrongUsage)
 )
 
 type SubPartitionDefinition struct {

diff --git a/parser/parser.go b/parser/parser.go
@@ -14012,8 +14012,8 @@ yynewstate:
 	case 212:
 		{
 			colDef := &ast.ColumnDef{Name: yyS[yypt-2].item.(*ast.ColumnName), Tp: yyS[yypt-1].item.(*types.FieldType), Options: yyS[yypt-0].item.([]*ast.ColumnOption)}
-			if !colDef.Validate() {
-				yylex.AppendError(yylex.Errorf("Invalid column definition"))
+			if err := colDef.Validate(); err != nil {
+				yylex.AppendError(err)
 				return 1
 			}
 			parser.yyVAL.item = colDef
@@ -14026,8 +14026,8 @@ yynewstate:
 			options = append(options, yyS[yypt-0].item.([]*ast.ColumnOption)...)
 			tp.AddFlag(mysql.UnsignedFlag)
 			colDef := &ast.ColumnDef{Name: yyS[yypt-2].item.(*ast.ColumnName), Tp: tp, Options: options}
-			if !colDef.Validate() {
-				yylex.AppendError(yylex.Errorf("Invalid column definition"))
+			if err := colDef.Validate(); err != nil {
+				yylex.AppendError(err)
 				return 1
 			}
 			parser.yyVAL.item = colDef

diff --git a/parser/parser.y b/parser/parser.y
@@ -3140,8 +3140,8 @@ ColumnDef:
 	ColumnName Type ColumnOptionListOpt
 	{
 		colDef := &ast.ColumnDef{Name: $1.(*ast.ColumnName), Tp: $2.(*types.FieldType), Options: $3.([]*ast.ColumnOption)}
-		if !colDef.Validate() {
-			yylex.AppendError(yylex.Errorf("Invalid column definition"))
+	        if err := colDef.Validate(); err != nil {
+			yylex.AppendError(err)
 			return 1
 		}
 		$$ = colDef
@@ -3154,8 +3154,8 @@ ColumnDef:
 		options = append(options, $3.([]*ast.ColumnOption)...)
 		tp.AddFlag(mysql.UnsignedFlag)
 		colDef := &ast.ColumnDef{Name: $1.(*ast.ColumnName), Tp: tp, Options: options}
-		if !colDef.Validate() {
-			yylex.AppendError(yylex.Errorf("Invalid column definition"))
+	        if err := colDef.Validate(); err != nil {
+			yylex.AppendError(err)
 			return 1
 		}
 		$$ = colDef

diff --git a/parser/parser_test.go b/parser/parser_test.go
@@ -5716,6 +5716,13 @@ func TestGeneratedColumn(t *testing.T) {
 			require.Error(t, err)
 		}
 	}
+
+	_, _, err := p.Parse("create table t1 (a int, b int as (a + 1) default 10);", "", "")
+	require.Equal(t, err.Error(), "[ddl:1221]Incorrect usage of DEFAULT and generated column")
+	_, _, err = p.Parse("create table t1 (a int, b int as (a + 1) on update now());", "", "")
+	require.Equal(t, err.Error(), "[ddl:1221]Incorrect usage of ON UPDATE and generated column")
+	_, _, err = p.Parse("create table t1 (a int, b int as (a + 1) auto_increment);", "", "")
+	require.Equal(t, err.Error(), "[ddl:1221]Incorrect usage of AUTO_INCREMENT and generated column")
 }
 
 func TestSetTransaction(t *testing.T) {