62 lines
1.9 KiB
Go
62 lines
1.9 KiB
Go
// Copyright 2022 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/util/ranger"
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)
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// CloneExprs uses Expression.Clone to clone a slice of Expression.
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func CloneExprs(exprs []expression.Expression) []expression.Expression {
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cloned := make([]expression.Expression, 0, len(exprs))
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for _, e := range exprs {
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cloned = append(cloned, e.Clone())
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}
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return cloned
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}
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// CloneCols uses (*Column).Clone to clone a slice of *Column.
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func CloneCols(cols []*expression.Column) []*expression.Column {
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cloned := make([]*expression.Column, 0, len(cols))
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for _, c := range cols {
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if c == nil {
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cloned = append(cloned, nil)
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continue
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}
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cloned = append(cloned, c.Clone().(*expression.Column))
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}
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return cloned
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}
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// CloneColInfos uses (*ColumnInfo).Clone to clone a slice of *ColumnInfo.
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func CloneColInfos(cols []*model.ColumnInfo) []*model.ColumnInfo {
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cloned := make([]*model.ColumnInfo, 0, len(cols))
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for _, c := range cols {
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cloned = append(cloned, c.Clone())
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}
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return cloned
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}
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// CloneRanges uses (*Range).Clone to clone a slice of *Range.
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func CloneRanges(ranges []*ranger.Range) []*ranger.Range {
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cloned := make([]*ranger.Range, 0, len(ranges))
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for _, r := range ranges {
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cloned = append(cloned, r.Clone())
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}
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return cloned
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}
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