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45 lines
1.2 KiB
45 lines
1.2 KiB
// Copyright 2020 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"fmt"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/sessionctx"
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)
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// ByItems wraps a "by" item.
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type ByItems struct {
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Expr expression.Expression
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Desc bool
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}
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// String implements fmt.Stringer interface.
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func (by *ByItems) String() string {
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if by.Desc {
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return fmt.Sprintf("%s true", by.Expr)
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}
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return by.Expr.String()
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}
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// Clone makes a copy of ByItems.
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func (by *ByItems) Clone() *ByItems {
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return &ByItems{Expr: by.Expr.Clone(), Desc: by.Desc}
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}
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// Equal checks whether two ByItems are equal.
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func (by *ByItems) Equal(ctx sessionctx.Context, other *ByItems) bool {
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return by.Expr.Equal(ctx, other.Expr) && by.Desc == other.Desc
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}
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