72 lines
2.4 KiB
Go
72 lines
2.4 KiB
Go
// Copyright 2024 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 model
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import (
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"fmt"
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"testing"
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"github.com/pingcap/tidb/pkg/parser/model"
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"github.com/stretchr/testify/require"
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)
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func newColumnForTest(id int64, offset int) *ColumnInfo {
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return &ColumnInfo{
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ID: id,
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Name: model.NewCIStr(fmt.Sprintf("c_%d", id)),
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Offset: offset,
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}
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}
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func newIndexForTest(id int64, cols ...*ColumnInfo) *IndexInfo {
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idxCols := make([]*IndexColumn, 0, len(cols))
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for _, c := range cols {
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idxCols = append(idxCols, &IndexColumn{Offset: c.Offset, Name: c.Name})
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}
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return &IndexInfo{
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ID: id,
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Name: model.NewCIStr(fmt.Sprintf("i_%d", id)),
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Columns: idxCols,
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}
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}
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func TestIsIndexPrefixCovered(t *testing.T) {
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c0 := newColumnForTest(0, 0)
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c1 := newColumnForTest(1, 1)
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c2 := newColumnForTest(2, 2)
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c3 := newColumnForTest(3, 3)
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c4 := newColumnForTest(4, 4)
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i0 := newIndexForTest(0, c0, c1, c2)
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i1 := newIndexForTest(1, c4, c2)
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tbl := &TableInfo{
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ID: 1,
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Name: model.NewCIStr("t"),
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Columns: []*ColumnInfo{c0, c1, c2, c3, c4},
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Indices: []*IndexInfo{i0, i1},
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}
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require.Equal(t, true, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_0")))
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require.Equal(t, true, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_0"), model.NewCIStr("c_1"), model.NewCIStr("c_2")))
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require.Equal(t, false, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_1")))
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require.Equal(t, false, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_2")))
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require.Equal(t, false, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_1"), model.NewCIStr("c_2")))
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require.Equal(t, false, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_0"), model.NewCIStr("c_2")))
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require.Equal(t, true, IsIndexPrefixCovered(tbl, i1, model.NewCIStr("c_4")))
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require.Equal(t, true, IsIndexPrefixCovered(tbl, i1, model.NewCIStr("c_4"), model.NewCIStr("c_2")))
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require.Equal(t, false, IsIndexPrefixCovered(tbl, i0, model.NewCIStr("c_2")))
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}
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