Merge pull request #3081 from actiontech/fix_not_null_rule

fix: not null rule when blob text

Author: BugsGuru

sqle/driver/mysql/rule/rule.go

@@ -4924,15 +4924,15 @@ func checkColumnNotNull(input *RuleHandlerInput) error {
 		for _, spec := range stmt.Specs {
 			for _, newColumn := range spec.NewColumns {
 				ok := util.IsAllInOptions(newColumn.Options, ast.ColumnOptionNotNull)
-				if !ok {
+				if !ok && !isBlob(newColumn) {
 					notNullColumns = append(notNullColumns, newColumn.Name.OrigColName())
 				}
 			}
 		}
 	case *ast.CreateTableStmt:
 		for _, col := range stmt.Cols {
 			ok := util.IsAllInOptions(col.Options, ast.ColumnOptionNotNull)
-			if !ok {
+			if !ok && !isBlob(col) {
 				notNullColumns = append(notNullColumns, col.Name.OrigColName())
 			}
 		}
@@ -4944,6 +4944,17 @@ func checkColumnNotNull(input *RuleHandlerInput) error {
 	return nil
 }
 
+func isBlob(columnDef *ast.ColumnDef) bool {
+	if columnDef.Tp == nil {
+		return false
+	}
+	switch columnDef.Tp.Tp {
+	case mysql.TypeBlob, mysql.TypeMediumBlob, mysql.TypeTinyBlob, mysql.TypeLongBlob:
+		return true
+	}
+	return false
+}
+
 func checkIndexSelectivity(input *RuleHandlerInput) error {
 	if _, ok := input.Node.(*ast.SelectStmt); !ok {
 		return nil