// Copyright 2020 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 // // http://www.apache.org/licenses/LICENSE-2.0 // // 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 util import ( "fmt" "github.com/pingcap/tidb/expression" "github.com/pingcap/tidb/sessionctx" ) // ByItems wraps a "by" item. type ByItems struct { Expr expression.Expression Desc bool } // String implements fmt.Stringer interface. func (by *ByItems) String() string { if by.Desc { return fmt.Sprintf("%s true", by.Expr) } return by.Expr.String() } // Clone makes a copy of ByItems. func (by *ByItems) Clone() *ByItems { return &ByItems{Expr: by.Expr.Clone(), Desc: by.Desc} } // Equal checks whether two ByItems are equal. func (by *ByItems) Equal(ctx sessionctx.Context, other *ByItems) bool { return by.Expr.Equal(ctx, other.Expr) && by.Desc == other.Desc }