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// Copyright 2019 PingCAP, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
// FieldName records the names used for mysql protocol.
type FieldName struct {
OrigTblName model.CIStr
OrigColName model.CIStr
DBName model.CIStr
TblName model.CIStr
ColName model.CIStr
Hidden bool
const emptyName = "EMPTY_NAME"
// String implements Stringer interface.
func (name *FieldName) String() string {
builder := strings.Builder{}
if name.Hidden {
return emptyName
if name.DBName.L != "" {
builder.WriteString(name.DBName.L + ".")
if name.TblName.L != "" {
builder.WriteString(name.TblName.L + ".")
return builder.String()
// NameSlice is the slice of the *fieldName
type NameSlice []*FieldName
// Shallow is a shallow copy, only making a new slice.
func (s NameSlice) Shallow() NameSlice {
ret := make(NameSlice, len(s))
copy(ret, s)
return ret
// EmptyName is to occupy the position in the name slice. If it's set, that column's name is hidden.
var EmptyName = &FieldName{Hidden: true}
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