492 lines
15 KiB
Go
492 lines
15 KiB
Go
// Copyright 2018 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 statistics
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import (
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"fmt"
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"testing"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/parser/mysql"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/codec"
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"github.com/pingcap/tidb/util/collate"
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"github.com/pingcap/tidb/util/mock"
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"github.com/pingcap/tidb/util/ranger"
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"github.com/stretchr/testify/require"
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)
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func TestNewHistogramBySelectivity(t *testing.T) {
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coll := &HistColl{
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Count: 330,
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Columns: make(map[int64]*Column),
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Indices: make(map[int64]*Index),
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}
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ctx := mock.NewContext()
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sc := ctx.GetSessionVars().StmtCtx
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intCol := &Column{}
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intCol.Histogram = *NewHistogram(1, 30, 30, 0, types.NewFieldType(mysql.TypeLonglong), chunk.InitialCapacity, 0)
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intCol.IsHandle = true
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intCol.StatsLoadedStatus = NewStatsFullLoadStatus()
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for i := 0; i < 10; i++ {
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intCol.Bounds.AppendInt64(0, int64(i*3))
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intCol.Bounds.AppendInt64(0, int64(i*3+2))
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intCol.Buckets = append(intCol.Buckets, Bucket{Repeat: 10, Count: int64(30*i + 30)})
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}
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coll.Columns[1] = intCol
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node := &StatsNode{ID: 1, Tp: PkType, Selectivity: 0.56}
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: types.MakeDatums(nil), HighVal: types.MakeDatums(nil), Collators: collate.GetBinaryCollatorSlice(1)})
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: []types.Datum{types.MinNotNullDatum()}, HighVal: types.MakeDatums(2), Collators: collate.GetBinaryCollatorSlice(1)})
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: types.MakeDatums(5), HighVal: types.MakeDatums(6), Collators: collate.GetBinaryCollatorSlice(1)})
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: types.MakeDatums(8), HighVal: types.MakeDatums(10), Collators: collate.GetBinaryCollatorSlice(1)})
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: types.MakeDatums(13), HighVal: types.MakeDatums(13), Collators: collate.GetBinaryCollatorSlice(1)})
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node.Ranges = append(node.Ranges, &ranger.Range{LowVal: types.MakeDatums(25), HighVal: []types.Datum{types.MaxValueDatum()}, Collators: collate.GetBinaryCollatorSlice(1)})
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intColResult := `column:1 ndv:16 totColSize:0
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num: 30 lower_bound: 0 upper_bound: 2 repeats: 10 ndv: 0
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num: 11 lower_bound: 6 upper_bound: 8 repeats: 0 ndv: 0
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num: 30 lower_bound: 9 upper_bound: 11 repeats: 0 ndv: 0
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num: 1 lower_bound: 12 upper_bound: 14 repeats: 0 ndv: 0
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num: 30 lower_bound: 27 upper_bound: 29 repeats: 0 ndv: 0`
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stringCol := &Column{}
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stringCol.StatsLoadedStatus = NewStatsFullLoadStatus()
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stringCol.Histogram = *NewHistogram(2, 15, 30, 0, types.NewFieldType(mysql.TypeString), chunk.InitialCapacity, 0)
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stringCol.Bounds.AppendString(0, "a")
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stringCol.Bounds.AppendString(0, "aaaabbbb")
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stringCol.Buckets = append(stringCol.Buckets, Bucket{Repeat: 10, Count: 60})
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stringCol.Bounds.AppendString(0, "bbbb")
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stringCol.Bounds.AppendString(0, "fdsfdsfds")
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stringCol.Buckets = append(stringCol.Buckets, Bucket{Repeat: 10, Count: 120})
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stringCol.Bounds.AppendString(0, "kkkkk")
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stringCol.Bounds.AppendString(0, "ooooo")
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stringCol.Buckets = append(stringCol.Buckets, Bucket{Repeat: 10, Count: 180})
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stringCol.Bounds.AppendString(0, "oooooo")
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stringCol.Bounds.AppendString(0, "sssss")
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stringCol.Buckets = append(stringCol.Buckets, Bucket{Repeat: 10, Count: 240})
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stringCol.Bounds.AppendString(0, "ssssssu")
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stringCol.Bounds.AppendString(0, "yyyyy")
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stringCol.Buckets = append(stringCol.Buckets, Bucket{Repeat: 10, Count: 300})
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stringCol.PreCalculateScalar()
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coll.Columns[2] = stringCol
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node2 := &StatsNode{ID: 2, Tp: ColType, Selectivity: 0.6}
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: types.MakeDatums(nil), HighVal: types.MakeDatums(nil), Collators: collate.GetBinaryCollatorSlice(1)})
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: []types.Datum{types.MinNotNullDatum()}, HighVal: types.MakeDatums("aaa"), Collators: collate.GetBinaryCollatorSlice(1)})
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: types.MakeDatums("aaaaaaaaaaa"), HighVal: types.MakeDatums("aaaaaaaaaaaaaa"), Collators: collate.GetBinaryCollatorSlice(1)})
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: types.MakeDatums("bbb"), HighVal: types.MakeDatums("cccc"), Collators: collate.GetBinaryCollatorSlice(1)})
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: types.MakeDatums("ddd"), HighVal: types.MakeDatums("fff"), Collators: collate.GetBinaryCollatorSlice(1)})
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node2.Ranges = append(node2.Ranges, &ranger.Range{LowVal: types.MakeDatums("ggg"), HighVal: []types.Datum{types.MaxValueDatum()}, Collators: collate.GetBinaryCollatorSlice(1)})
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stringColResult := `column:2 ndv:9 totColSize:0
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num: 60 lower_bound: a upper_bound: aaaabbbb repeats: 0 ndv: 0
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num: 52 lower_bound: bbbb upper_bound: fdsfdsfds repeats: 0 ndv: 0
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num: 54 lower_bound: kkkkk upper_bound: ooooo repeats: 0 ndv: 0
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num: 60 lower_bound: oooooo upper_bound: sssss repeats: 0 ndv: 0
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num: 60 lower_bound: ssssssu upper_bound: yyyyy repeats: 0 ndv: 0`
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newColl := coll.NewHistCollBySelectivity(ctx, []*StatsNode{node, node2})
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require.Equal(t, intColResult, newColl.Columns[1].String())
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require.Equal(t, stringColResult, newColl.Columns[2].String())
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idx := &Index{Info: &model.IndexInfo{Columns: []*model.IndexColumn{{Name: model.NewCIStr("a"), Offset: 0}}}}
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coll.Indices[0] = idx
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idx.Histogram = *NewHistogram(0, 15, 0, 0, types.NewFieldType(mysql.TypeBlob), 0, 0)
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for i := 0; i < 5; i++ {
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low, err1 := codec.EncodeKey(sc, nil, types.NewIntDatum(int64(i*3)))
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require.NoError(t, err1)
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high, err2 := codec.EncodeKey(sc, nil, types.NewIntDatum(int64(i*3+2)))
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require.NoError(t, err2)
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idx.Bounds.AppendBytes(0, low)
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idx.Bounds.AppendBytes(0, high)
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idx.Buckets = append(idx.Buckets, Bucket{Repeat: 10, Count: int64(30*i + 30)})
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}
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idx.PreCalculateScalar()
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node3 := &StatsNode{ID: 0, Tp: IndexType, Selectivity: 0.47}
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node3.Ranges = append(node3.Ranges, &ranger.Range{LowVal: types.MakeDatums(2), HighVal: types.MakeDatums(3), Collators: collate.GetBinaryCollatorSlice(1)})
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node3.Ranges = append(node3.Ranges, &ranger.Range{LowVal: types.MakeDatums(10), HighVal: types.MakeDatums(13), Collators: collate.GetBinaryCollatorSlice(1)})
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idxResult := `index:0 ndv:7
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num: 30 lower_bound: 0 upper_bound: 2 repeats: 10 ndv: 0
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num: 30 lower_bound: 3 upper_bound: 5 repeats: 10 ndv: 0
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num: 30 lower_bound: 9 upper_bound: 11 repeats: 10 ndv: 0
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num: 30 lower_bound: 12 upper_bound: 14 repeats: 10 ndv: 0`
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newColl = coll.NewHistCollBySelectivity(ctx, []*StatsNode{node3})
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require.Equal(t, idxResult, newColl.Indices[0].String())
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}
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func TestTruncateHistogram(t *testing.T) {
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hist := NewHistogram(0, 0, 0, 0, types.NewFieldType(mysql.TypeLonglong), 1, 0)
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low, high := types.NewIntDatum(0), types.NewIntDatum(1)
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hist.AppendBucket(&low, &high, 0, 1)
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newHist := hist.TruncateHistogram(1)
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require.True(t, HistogramEqual(hist, newHist, true))
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newHist = hist.TruncateHistogram(0)
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require.Equal(t, 0, newHist.Len())
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}
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func TestValueToString4InvalidKey(t *testing.T) {
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bytes, err := codec.EncodeKey(nil, nil, types.NewDatum(1), types.NewDatum(0.5))
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require.NoError(t, err)
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// Append invalid flag.
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bytes = append(bytes, 20)
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datum := types.NewDatum(bytes)
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res, err := ValueToString(nil, &datum, 3, nil)
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require.NoError(t, err)
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require.Equal(t, "(1, 0.5, \x14)", res)
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}
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type bucket4Test struct {
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lower int64
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upper int64
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count int64
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repeat int64
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ndv int64
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}
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type topN4Test struct {
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data int64
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count int64
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}
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func genHist4Test(t *testing.T, buckets []*bucket4Test, totColSize int64) *Histogram {
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h := NewHistogram(0, 0, 0, 0, types.NewFieldType(mysql.TypeBlob), len(buckets), totColSize)
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for _, bucket := range buckets {
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lower, err := codec.EncodeKey(nil, nil, types.NewIntDatum(bucket.lower))
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require.NoError(t, err)
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upper, err := codec.EncodeKey(nil, nil, types.NewIntDatum(bucket.upper))
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require.NoError(t, err)
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di, du := types.NewBytesDatum(lower), types.NewBytesDatum(upper)
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h.AppendBucketWithNDV(&di, &du, bucket.count, bucket.repeat, bucket.ndv)
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}
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return h
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}
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func TestMergePartitionLevelHist(t *testing.T) {
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type testCase struct {
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partitionHists [][]*bucket4Test
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totColSize []int64
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popedTopN []topN4Test
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expHist []*bucket4Test
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expBucketNumber int64
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}
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tests := []testCase{
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{
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partitionHists: [][]*bucket4Test{
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{
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// Col(1) = [1, 4,|| 6, 9, 9,|| 12, 12, 12,|| 13, 14, 15]
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{
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lower: 1,
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upper: 4,
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count: 2,
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repeat: 1,
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ndv: 2,
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},
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{
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lower: 6,
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upper: 9,
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count: 5,
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repeat: 2,
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ndv: 2,
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},
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{
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lower: 12,
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upper: 12,
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count: 8,
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repeat: 3,
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ndv: 1,
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},
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{
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lower: 13,
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upper: 15,
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count: 11,
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repeat: 1,
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ndv: 3,
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},
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},
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// Col(2) = [2, 5,|| 6, 7, 7,|| 11, 11, 11,|| 13, 14, 17]
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{
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{
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lower: 2,
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upper: 5,
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count: 2,
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repeat: 1,
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ndv: 2,
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},
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{
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lower: 6,
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upper: 7,
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count: 5,
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repeat: 2,
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ndv: 2,
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},
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{
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lower: 11,
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upper: 11,
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count: 8,
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repeat: 3,
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ndv: 1,
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},
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{
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lower: 13,
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upper: 17,
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count: 11,
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repeat: 1,
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ndv: 3,
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},
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},
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},
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totColSize: []int64{11, 11},
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popedTopN: []topN4Test{},
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expHist: []*bucket4Test{
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{
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lower: 1,
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upper: 7,
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count: 7,
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repeat: 3,
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ndv: 5,
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},
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{
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lower: 7,
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upper: 11,
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count: 13,
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repeat: 3,
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ndv: 3,
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},
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{
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lower: 11,
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upper: 17,
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count: 22,
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repeat: 1,
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ndv: 6,
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},
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},
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expBucketNumber: 3,
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},
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{
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partitionHists: [][]*bucket4Test{
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{
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// Col(1) = [1, 4,|| 6, 9, 9,|| 12, 12, 12,|| 13, 14, 15]
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{
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lower: 1,
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upper: 4,
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count: 2,
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repeat: 1,
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ndv: 2,
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},
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{
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lower: 6,
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upper: 9,
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count: 5,
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repeat: 2,
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ndv: 2,
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},
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{
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lower: 12,
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upper: 12,
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count: 8,
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repeat: 3,
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ndv: 1,
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},
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{
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lower: 13,
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upper: 15,
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count: 11,
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repeat: 1,
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ndv: 3,
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},
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},
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// Col(2) = [2, 5,|| 6, 7, 7,|| 11, 11, 11,|| 13, 14, 17]
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{
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{
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lower: 2,
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upper: 5,
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count: 2,
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repeat: 1,
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ndv: 2,
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},
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{
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lower: 6,
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upper: 7,
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count: 5,
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repeat: 2,
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ndv: 2,
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},
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{
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lower: 11,
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upper: 11,
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count: 8,
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repeat: 3,
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ndv: 1,
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},
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{
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lower: 13,
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upper: 17,
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count: 11,
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repeat: 1,
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ndv: 3,
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},
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},
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},
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totColSize: []int64{11, 11},
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popedTopN: []topN4Test{
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{
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data: 18,
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count: 5,
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},
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{
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data: 4,
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count: 6,
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},
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},
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expHist: []*bucket4Test{
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{
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lower: 1,
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upper: 5,
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count: 10,
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repeat: 1,
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ndv: 3,
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},
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{
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lower: 5,
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upper: 12,
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count: 22,
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repeat: 3,
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ndv: 6,
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},
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{
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lower: 12,
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upper: 18,
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count: 33,
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repeat: 5,
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ndv: 6,
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},
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},
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expBucketNumber: 3,
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},
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}
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for _, tt := range tests {
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var expTotColSize int64
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hists := make([]*Histogram, 0, len(tt.partitionHists))
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for i := range tt.partitionHists {
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hists = append(hists, genHist4Test(t, tt.partitionHists[i], tt.totColSize[i]))
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expTotColSize += tt.totColSize[i]
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}
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ctx := mock.NewContext()
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sc := ctx.GetSessionVars().StmtCtx
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poped := make([]TopNMeta, 0, len(tt.popedTopN))
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for _, top := range tt.popedTopN {
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b, err := codec.EncodeKey(sc, nil, types.NewIntDatum(top.data))
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require.NoError(t, err)
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tmp := TopNMeta{
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Encoded: b,
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Count: uint64(top.count),
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}
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poped = append(poped, tmp)
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}
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globalHist, err := MergePartitionHist2GlobalHist(sc, hists, poped, tt.expBucketNumber, true)
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require.NoError(t, err)
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for i, b := range tt.expHist {
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lo, err := ValueToString(ctx.GetSessionVars(), globalHist.GetLower(i), 1, []byte{types.KindInt64})
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require.NoError(t, err)
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up, err := ValueToString(ctx.GetSessionVars(), globalHist.GetUpper(i), 1, []byte{types.KindInt64})
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require.NoError(t, err)
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require.Equal(t, lo, fmt.Sprintf("%v", b.lower))
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require.Equal(t, up, fmt.Sprintf("%v", b.upper))
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require.Equal(t, globalHist.Buckets[i].Count, b.count)
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require.Equal(t, globalHist.Buckets[i].Repeat, b.repeat)
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require.Equal(t, globalHist.Buckets[i].NDV, b.ndv)
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}
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require.Equal(t, expTotColSize, globalHist.TotColSize)
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}
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}
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func genBucket4Merging4Test(lower, upper, ndv, disjointNDV int64) bucket4Merging {
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l := types.NewIntDatum(lower)
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r := types.NewIntDatum(upper)
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return bucket4Merging{
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lower: &l,
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upper: &r,
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Bucket: Bucket{
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NDV: ndv,
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},
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disjointNDV: disjointNDV,
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}
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}
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func TestMergeBucketNDV(t *testing.T) {
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type testData struct {
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left bucket4Merging
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right bucket4Merging
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result bucket4Merging
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}
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tests := []testData{
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{
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left: genBucket4Merging4Test(1, 2, 2, 0),
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right: genBucket4Merging4Test(1, 2, 3, 0),
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result: genBucket4Merging4Test(1, 2, 3, 0),
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},
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{
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left: genBucket4Merging4Test(1, 3, 2, 0),
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right: genBucket4Merging4Test(2, 3, 2, 0),
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result: genBucket4Merging4Test(1, 3, 3, 0),
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},
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{
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left: genBucket4Merging4Test(1, 3, 2, 0),
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right: genBucket4Merging4Test(4, 6, 2, 2),
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result: genBucket4Merging4Test(1, 3, 2, 4),
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},
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{
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left: genBucket4Merging4Test(1, 5, 5, 0),
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right: genBucket4Merging4Test(2, 6, 5, 0),
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result: genBucket4Merging4Test(1, 6, 6, 0),
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},
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{
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|
left: genBucket4Merging4Test(3, 5, 3, 0),
|
|
right: genBucket4Merging4Test(2, 6, 4, 0),
|
|
result: genBucket4Merging4Test(2, 6, 5, 0),
|
|
},
|
|
}
|
|
sc := mock.NewContext().GetSessionVars().StmtCtx
|
|
for _, tt := range tests {
|
|
res, err := mergeBucketNDV(sc, &tt.left, &tt.right)
|
|
require.NoError(t, err)
|
|
require.Equal(t, res.lower.GetInt64(), tt.result.lower.GetInt64())
|
|
require.Equal(t, res.upper.GetInt64(), tt.result.upper.GetInt64())
|
|
require.Equal(t, res.NDV, tt.result.NDV)
|
|
require.Equal(t, res.disjointNDV, tt.result.disjointNDV)
|
|
}
|
|
}
|
|
|
|
func TestIndexQueryBytes(t *testing.T) {
|
|
ctx := mock.NewContext()
|
|
sc := ctx.GetSessionVars().StmtCtx
|
|
idx := &Index{Info: &model.IndexInfo{Columns: []*model.IndexColumn{{Name: model.NewCIStr("a"), Offset: 0}}}}
|
|
idx.Histogram = *NewHistogram(0, 15, 0, 0, types.NewFieldType(mysql.TypeBlob), 0, 0)
|
|
low, err1 := codec.EncodeKey(sc, nil, types.NewBytesDatum([]byte("0")))
|
|
require.NoError(t, err1)
|
|
high, err2 := codec.EncodeKey(sc, nil, types.NewBytesDatum([]byte("3")))
|
|
require.NoError(t, err2)
|
|
idx.Bounds.AppendBytes(0, low)
|
|
idx.Bounds.AppendBytes(0, high)
|
|
idx.Buckets = append(idx.Buckets, Bucket{Repeat: 10, Count: 20, NDV: 20})
|
|
idx.PreCalculateScalar()
|
|
idx.CMSketch = nil
|
|
// Count / NDV
|
|
require.Equal(t, idx.QueryBytes(low), uint64(1))
|
|
// Repeat
|
|
require.Equal(t, idx.QueryBytes(high), uint64(10))
|
|
}
|