417 lines
18 KiB
Go
417 lines
18 KiB
Go
// Copyright 2021 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_test
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import (
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"math"
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"strconv"
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"testing"
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"github.com/pingcap/failpoint"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/statistics"
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"github.com/pingcap/tidb/testkit"
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"github.com/pingcap/tidb/testkit/testdata"
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"github.com/stretchr/testify/require"
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)
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func TestChangeVerTo2Behavior(t *testing.T) {
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t.Parallel()
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store, dom, clean := testkit.CreateMockStoreAndDomain(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table t(a int, b int, index idx(a))")
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tk.MustExec("set @@session.tidb_analyze_version = 1")
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tk.MustExec("insert into t values(1, 1), (1, 2), (1, 3)")
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tk.MustExec("analyze table t")
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is := dom.InfoSchema()
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tblT, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
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require.NoError(t, err)
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h := dom.StatsHandle()
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require.NoError(t, h.Update(is))
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statsTblT := h.GetTableStats(tblT.Meta())
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// Analyze table with version 1 success, all statistics are version 1.
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(1), col.StatsVer)
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}
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(1), idx.StatsVer)
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}
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tk.MustExec("set @@session.tidb_analyze_version = 2")
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tk.MustExec("analyze table t index idx")
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tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 The analyze version from the session is not compatible with the existing statistics of the table. Use the existing version instead"))
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(1), idx.StatsVer)
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}
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tk.MustExec("analyze table t index")
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tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 The analyze version from the session is not compatible with the existing statistics of the table. Use the existing version instead"))
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(1), idx.StatsVer)
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}
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tk.MustExec("analyze table t ")
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(2), col.StatsVer)
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}
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(2), idx.StatsVer)
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}
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tk.MustExec("set @@session.tidb_analyze_version = 1")
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tk.MustExec("analyze table t index idx")
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tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 The analyze version from the session is not compatible with the existing statistics of the table. Use the existing version instead",
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"Warning 1105 The version 2 would collect all statistics not only the selected indexes"))
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(2), idx.StatsVer)
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}
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tk.MustExec("analyze table t index")
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tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 The analyze version from the session is not compatible with the existing statistics of the table. Use the existing version instead",
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"Warning 1105 The version 2 would collect all statistics not only the selected indexes"))
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(2), idx.StatsVer)
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}
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tk.MustExec("analyze table t ")
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(1), col.StatsVer)
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}
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(1), idx.StatsVer)
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}
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}
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func TestFastAnalyzeOnVer2(t *testing.T) {
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t.Parallel()
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store, dom, clean := testkit.CreateMockStoreAndDomain(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table t(a int, b int, index idx(a))")
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tk.MustExec("set @@session.tidb_analyze_version = 2")
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tk.MustExec("set @@session.tidb_enable_fast_analyze = 1")
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tk.MustExec("insert into t values(1, 1), (1, 2), (1, 3)")
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_, err := tk.Exec("analyze table t")
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require.Error(t, err)
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require.Equal(t, "Fast analyze hasn't reached General Availability and only support analyze version 1 currently.", err.Error())
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tk.MustExec("set @@session.tidb_enable_fast_analyze = 0")
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tk.MustExec("analyze table t")
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is := dom.InfoSchema()
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tblT, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
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require.NoError(t, err)
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h := dom.StatsHandle()
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require.NoError(t, h.Update(is))
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statsTblT := h.GetTableStats(tblT.Meta())
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(2), col.StatsVer)
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}
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(2), idx.StatsVer)
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}
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tk.MustExec("set @@session.tidb_enable_fast_analyze = 1")
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err = tk.ExecToErr("analyze table t index idx")
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require.Error(t, err)
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require.Equal(t, "Fast analyze hasn't reached General Availability and only support analyze version 1 currently.", err.Error())
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tk.MustExec("set @@session.tidb_analyze_version = 1")
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_, err = tk.Exec("analyze table t index idx")
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require.Error(t, err)
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require.Equal(t, "Fast analyze hasn't reached General Availability and only support analyze version 1 currently. But the existing statistics of the table is not version 1.", err.Error())
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_, err = tk.Exec("analyze table t index")
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require.Error(t, err)
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require.Equal(t, "Fast analyze hasn't reached General Availability and only support analyze version 1 currently. But the existing statistics of the table is not version 1.", err.Error())
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tk.MustExec("analyze table t")
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require.NoError(t, h.Update(is))
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statsTblT = h.GetTableStats(tblT.Meta())
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(1), col.StatsVer)
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}
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for _, idx := range statsTblT.Indices {
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require.Equal(t, int64(1), idx.StatsVer)
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}
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}
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func TestIncAnalyzeOnVer2(t *testing.T) {
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t.Parallel()
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store, dom, clean := testkit.CreateMockStoreAndDomain(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table t(a int, b int, index idx(a))")
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tk.MustExec("set @@session.tidb_analyze_version = 2")
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tk.MustExec("insert into t values(1, 1), (1, 2)")
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tk.MustExec("analyze table t with 2 topn")
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is := dom.InfoSchema()
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h := dom.StatsHandle()
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require.NoError(t, h.Update(is))
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tk.MustExec("insert into t values(2, 1), (2, 2), (2, 3), (3, 3), (4, 4), (4, 3), (4, 2), (4, 1)")
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require.NoError(t, h.Update(is))
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tk.MustExec("analyze incremental table t index idx with 2 topn")
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// After analyze, there's two val in hist.
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tk.MustQuery("show stats_buckets where table_name = 't' and column_name = 'idx'").Check(testkit.Rows(
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"test t idx 1 0 2 2 1 1 0",
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"test t idx 1 1 3 1 3 3 0",
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))
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// Two val in topn.
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tk.MustQuery("show stats_topn where table_name = 't' and column_name = 'idx'").Check(testkit.Rows(
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"test t idx 1 2 3",
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"test t idx 1 4 4",
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))
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}
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func TestExpBackoffEstimation(t *testing.T) {
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t.Parallel()
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store, clean := testkit.CreateMockStore(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("create table exp_backoff(a int, b int, c int, d int, index idx(a, b, c, d))")
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tk.MustExec("insert into exp_backoff values(1, 1, 1, 1), (1, 1, 1, 2), (1, 1, 2, 3), (1, 2, 2, 4), (1, 2, 3, 5)")
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tk.MustExec("set @@session.tidb_analyze_version=2")
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tk.MustExec("analyze table exp_backoff")
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var (
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input []string
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output [][]string
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)
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integrationSuiteData := statistics.GetIntegrationSuiteData()
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integrationSuiteData.GetTestCases(t, &input, &output)
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inputLen := len(input)
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// The test cases are:
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// Query a = 1, b = 1, c = 1, d >= 3 and d <= 5 separately. We got 5, 3, 2, 3.
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// And then query and a = 1 and b = 1 and c = 1 and d >= 3 and d <= 5. It's result should follow the exp backoff,
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// which is 2/5 * (3/5)^{1/2} * (3/5)*{1/4} * 1^{1/8} * 5 = 1.3634.
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for i := 0; i < inputLen-1; i++ {
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testdata.OnRecord(func() {
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output[i] = testdata.ConvertRowsToStrings(tk.MustQuery(input[i]).Rows())
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})
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tk.MustQuery(input[i]).Check(testkit.Rows(output[i]...))
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}
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// The last case is that no column is loaded and we get no stats at all.
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require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/statistics/cleanEstResults", `return(true)`))
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testdata.OnRecord(func() {
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output[inputLen-1] = testdata.ConvertRowsToStrings(tk.MustQuery(input[inputLen-1]).Rows())
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})
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tk.MustQuery(input[inputLen-1]).Check(testkit.Rows(output[inputLen-1]...))
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require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/statistics/cleanEstResults"))
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}
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func TestGlobalStats(t *testing.T) {
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t.Parallel()
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store, clean := testkit.CreateMockStore(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t;")
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tk.MustExec("set @@session.tidb_analyze_version = 2;")
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tk.MustExec(`create table t (a int, key(a)) partition by range (a) (
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partition p0 values less than (10),
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partition p1 values less than (20),
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partition p2 values less than (30)
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);`)
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tk.MustExec("set @@tidb_partition_prune_mode = 'dynamic';")
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tk.MustExec("insert into t values (1), (5), (null), (11), (15), (21), (25);")
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tk.MustExec("analyze table t;")
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// On the table with global-stats, we use explain to query a multi-partition query.
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// And we should get the result that global-stats is used instead of pseudo-stats.
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tk.MustQuery("explain format = 'brief' select a from t where a > 5").Check(testkit.Rows(
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"IndexReader 4.00 root partition:all index:IndexRangeScan",
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"└─IndexRangeScan 4.00 cop[tikv] table:t, index:a(a) range:(5,+inf], keep order:false"))
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// On the table with global-stats, we use explain to query a single-partition query.
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// And we should get the result that global-stats is used instead of pseudo-stats.
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tk.MustQuery("explain format = 'brief' select * from t partition(p1) where a > 15;").Check(testkit.Rows(
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"IndexReader 2.00 root partition:p1 index:IndexRangeScan",
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"└─IndexRangeScan 2.00 cop[tikv] table:t, index:a(a) range:(15,+inf], keep order:false"))
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// Even if we have global-stats, we will not use it when the switch is set to `static`.
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tk.MustExec("set @@tidb_partition_prune_mode = 'static';")
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tk.MustQuery("explain format = 'brief' select a from t where a > 5").Check(testkit.Rows(
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"PartitionUnion 4.00 root ",
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"├─IndexReader 0.00 root index:IndexRangeScan",
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"│ └─IndexRangeScan 0.00 cop[tikv] table:t, partition:p0, index:a(a) range:(5,+inf], keep order:false",
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"├─IndexReader 2.00 root index:IndexRangeScan",
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"│ └─IndexRangeScan 2.00 cop[tikv] table:t, partition:p1, index:a(a) range:(5,+inf], keep order:false",
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"└─IndexReader 2.00 root index:IndexRangeScan",
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" └─IndexRangeScan 2.00 cop[tikv] table:t, partition:p2, index:a(a) range:(5,+inf], keep order:false"))
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tk.MustExec("set @@tidb_partition_prune_mode = 'static';")
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tk.MustExec("drop table t;")
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tk.MustExec("create table t(a int, b int, key(a)) PARTITION BY HASH(a) PARTITIONS 2;")
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tk.MustExec("insert into t values(1,1),(3,3),(4,4),(2,2),(5,5);")
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// When we set the mode to `static`, using analyze will not report an error and will not generate global-stats.
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// In addition, when using explain to view the plan of the related query, it was found that `Union` was used.
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tk.MustExec("analyze table t;")
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result := tk.MustQuery("show stats_meta where table_name = 't'").Sort()
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require.Len(t, result.Rows(), 2)
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require.Equal(t, "2", result.Rows()[0][5])
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require.Equal(t, "3", result.Rows()[1][5])
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tk.MustQuery("explain format = 'brief' select a from t where a > 3;").Check(testkit.Rows(
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"PartitionUnion 2.00 root ",
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"├─IndexReader 1.00 root index:IndexRangeScan",
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"│ └─IndexRangeScan 1.00 cop[tikv] table:t, partition:p0, index:a(a) range:(3,+inf], keep order:false",
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"└─IndexReader 1.00 root index:IndexRangeScan",
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" └─IndexRangeScan 1.00 cop[tikv] table:t, partition:p1, index:a(a) range:(3,+inf], keep order:false"))
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// When we turned on the switch, we found that pseudo-stats will be used in the plan instead of `Union`.
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tk.MustExec("set @@tidb_partition_prune_mode = 'dynamic';")
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tk.MustQuery("explain format = 'brief' select a from t where a > 3;").Check(testkit.Rows(
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"IndexReader 3333.33 root partition:all index:IndexRangeScan",
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"└─IndexRangeScan 3333.33 cop[tikv] table:t, index:a(a) range:(3,+inf], keep order:false, stats:pseudo"))
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// Execute analyze again without error and can generate global-stats.
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// And when executing related queries, neither Union nor pseudo-stats are used.
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tk.MustExec("analyze table t;")
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result = tk.MustQuery("show stats_meta where table_name = 't'").Sort()
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require.Len(t, result.Rows(), 3)
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require.Equal(t, "5", result.Rows()[0][5])
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require.Equal(t, "2", result.Rows()[1][5])
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require.Equal(t, "3", result.Rows()[2][5])
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tk.MustQuery("explain format = 'brief' select a from t where a > 3;").Check(testkit.Rows(
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"IndexReader 2.00 root partition:all index:IndexRangeScan",
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"└─IndexRangeScan 2.00 cop[tikv] table:t, index:a(a) range:(3,+inf], keep order:false"))
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tk.MustExec("drop table t;")
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tk.MustExec("create table t (a int, b int, c int) PARTITION BY HASH(a) PARTITIONS 2;")
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tk.MustExec("set @@tidb_partition_prune_mode = 'dynamic';")
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tk.MustExec("create index idx_ab on t(a, b);")
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tk.MustExec("insert into t values (1, 1, 1), (5, 5, 5), (11, 11, 11), (15, 15, 15), (21, 21, 21), (25, 25, 25);")
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tk.MustExec("analyze table t;")
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// test the indexScan
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tk.MustQuery("explain format = 'brief' select b from t where a > 5 and b > 10;").Check(testkit.Rows(
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"Projection 2.67 root test.t.b",
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"└─IndexReader 2.67 root partition:all index:Selection",
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" └─Selection 2.67 cop[tikv] gt(test.t.b, 10)",
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" └─IndexRangeScan 4.00 cop[tikv] table:t, index:idx_ab(a, b) range:(5,+inf], keep order:false"))
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// test the indexLookUp
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tk.MustQuery("explain format = 'brief' select * from t use index(idx_ab) where a > 1;").Check(testkit.Rows(
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"IndexLookUp 5.00 root partition:all ",
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"├─IndexRangeScan(Build) 5.00 cop[tikv] table:t, index:idx_ab(a, b) range:(1,+inf], keep order:false",
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"└─TableRowIDScan(Probe) 5.00 cop[tikv] table:t keep order:false"))
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// test the tableScan
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tk.MustQuery("explain format = 'brief' select * from t;").Check(testkit.Rows(
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"TableReader 6.00 root partition:all data:TableFullScan",
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"└─TableFullScan 6.00 cop[tikv] table:t keep order:false"))
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}
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func TestNULLOnFullSampling(t *testing.T) {
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t.Parallel()
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store, dom, clean := testkit.CreateMockStoreAndDomain(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t;")
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tk.MustExec("set @@session.tidb_analyze_version = 2;")
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tk.MustExec("create table t(a int, index idx(a))")
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tk.MustExec("insert into t values(1), (1), (1), (2), (2), (3), (4), (null), (null), (null)")
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var (
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input []string
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output [][]string
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)
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tk.MustExec("analyze table t with 2 topn")
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is := dom.InfoSchema()
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tblT, err := is.TableByName(model.NewCIStr("test"), model.NewCIStr("t"))
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require.NoError(t, err)
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h := dom.StatsHandle()
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require.NoError(t, h.Update(is))
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statsTblT := h.GetTableStats(tblT.Meta())
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// Check the null count is 3.
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for _, col := range statsTblT.Columns {
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require.Equal(t, int64(3), col.NullCount)
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}
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integrationSuiteData := statistics.GetIntegrationSuiteData()
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integrationSuiteData.GetTestCases(t, &input, &output)
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// Check the topn and buckets contains no null values.
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for i := 0; i < len(input); i++ {
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testdata.OnRecord(func() {
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output[i] = testdata.ConvertRowsToStrings(tk.MustQuery(input[i]).Rows())
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})
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tk.MustQuery(input[i]).Check(testkit.Rows(output[i]...))
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}
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}
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func TestAnalyzeSnapshot(t *testing.T) {
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t.Parallel()
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store, clean := testkit.CreateMockStore(t)
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defer clean()
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t")
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tk.MustExec("set @@session.tidb_analyze_version = 2;")
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tk.MustExec("create table t(a int)")
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tk.MustExec("insert into t values(1), (1), (1)")
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tk.MustExec("analyze table t")
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rows := tk.MustQuery("select count, snapshot from mysql.stats_meta").Rows()
|
|
require.Len(t, rows, 1)
|
|
require.Equal(t, "3", rows[0][0])
|
|
s1Str := rows[0][1].(string)
|
|
s1, err := strconv.ParseUint(s1Str, 10, 64)
|
|
require.NoError(t, err)
|
|
require.True(t, s1 < math.MaxUint64)
|
|
tk.MustExec("insert into t values(1), (1), (1)")
|
|
tk.MustExec("analyze table t")
|
|
rows = tk.MustQuery("select count, snapshot from mysql.stats_meta").Rows()
|
|
require.Len(t, rows, 1)
|
|
require.Equal(t, "6", rows[0][0])
|
|
s2Str := rows[0][1].(string)
|
|
s2, err := strconv.ParseUint(s2Str, 10, 64)
|
|
require.NoError(t, err)
|
|
require.True(t, s2 < math.MaxUint64)
|
|
require.True(t, s2 > s1)
|
|
}
|
|
|
|
func TestHistogramsWithSameTxnTS(t *testing.T) {
|
|
t.Parallel()
|
|
store, clean := testkit.CreateMockStore(t)
|
|
defer clean()
|
|
tk := testkit.NewTestKit(t, store)
|
|
tk.MustExec("use test")
|
|
tk.MustExec("drop table if exists t")
|
|
tk.MustExec("set @@session.tidb_analyze_version = 2;")
|
|
tk.MustExec("create table t(a int, index(a))")
|
|
tk.MustExec("insert into t values(1), (1), (1)")
|
|
tk.MustExec("analyze table t")
|
|
rows := tk.MustQuery("select version from mysql.stats_meta").Rows()
|
|
require.Len(t, rows, 1)
|
|
v1 := rows[0][0].(string)
|
|
rows = tk.MustQuery("select version from mysql.stats_histograms").Rows()
|
|
require.Len(t, rows, 2)
|
|
v2 := rows[0][0].(string)
|
|
require.Equal(t, v1, v2)
|
|
v3 := rows[1][0].(string)
|
|
require.Equal(t, v2, v3)
|
|
}
|
|
|
|
func TestAnalyzeLongString(t *testing.T) {
|
|
t.Parallel()
|
|
store, clean := testkit.CreateMockStore(t)
|
|
defer clean()
|
|
tk := testkit.NewTestKit(t, store)
|
|
tk.MustExec("use test")
|
|
tk.MustExec("drop table if exists t")
|
|
tk.MustExec("set @@session.tidb_analyze_version = 2;")
|
|
tk.MustExec("create table t(a longtext);")
|
|
tk.MustExec("insert into t value(repeat(\"a\",65536));")
|
|
tk.MustExec("insert into t value(repeat(\"b\",65536));")
|
|
tk.MustExec("analyze table t with 0 topn")
|
|
}
|