348 lines
14 KiB
Go
348 lines
14 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package core_test
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import (
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"context"
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"math"
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"strconv"
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"time"
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. "github.com/pingcap/check"
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"github.com/pingcap/parser/terror"
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"github.com/pingcap/tidb/executor"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/metrics"
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"github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/util/testkit"
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"github.com/pingcap/tidb/util/testleak"
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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)
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var _ = Suite(&testPrepareSuite{})
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type testPrepareSuite struct {
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}
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func (s *testPrepareSuite) TestPrepareCache(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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orgEnable := core.PreparedPlanCacheEnabled()
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orgCapacity := core.PreparedPlanCacheCapacity
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orgMemGuardRatio := core.PreparedPlanCacheMemoryGuardRatio
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orgMaxMemory := core.PreparedPlanCacheMaxMemory
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defer func() {
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dom.Close()
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store.Close()
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core.SetPreparedPlanCache(orgEnable)
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core.PreparedPlanCacheCapacity = orgCapacity
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core.PreparedPlanCacheMemoryGuardRatio = orgMemGuardRatio
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core.PreparedPlanCacheMaxMemory = orgMaxMemory
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}()
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core.SetPreparedPlanCache(true)
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core.PreparedPlanCacheCapacity = 100
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core.PreparedPlanCacheMemoryGuardRatio = 0.1
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// PreparedPlanCacheMaxMemory is set to MAX_UINT64 to make sure the cache
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// behavior would not be effected by the uncertain memory utilization.
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core.PreparedPlanCacheMaxMemory.Store(math.MaxUint64)
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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("create table t(a int primary key, b int, c int, index idx1(b, a), index idx2(b))")
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tk.MustExec("insert into t values(1, 1, 1), (2, 2, 2), (3, 3, 3), (4, 4, 4), (5, 5, 5), (6, 1, 2)")
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tk.MustExec(`prepare stmt1 from "select * from t use index(idx1) where a = ? and b = ?"`)
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tk.MustExec(`prepare stmt2 from "select a, b from t use index(idx2) where b = ?"`)
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tk.MustExec(`prepare stmt3 from "select * from t where a = ?"`)
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tk.MustExec("set @a=1, @b=1")
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// When executing one statement at the first time, we don't use cache, so we need to execute it at least twice to test the cache.
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tk.MustQuery("execute stmt1 using @a, @b").Check(testkit.Rows("1 1 1"))
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tk.MustQuery("execute stmt1 using @a, @b").Check(testkit.Rows("1 1 1"))
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tk.MustQuery("execute stmt2 using @b").Check(testkit.Rows("1 1", "6 1"))
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tk.MustQuery("execute stmt2 using @b").Check(testkit.Rows("1 1", "6 1"))
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tk.MustQuery("execute stmt3 using @a").Check(testkit.Rows("1 1 1"))
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tk.MustQuery("execute stmt3 using @a").Check(testkit.Rows("1 1 1"))
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tk.MustExec(`prepare stmt4 from "select * from t where a > ?"`)
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tk.MustExec("set @a=3")
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tk.MustQuery("execute stmt4 using @a").Check(testkit.Rows("4 4 4", "5 5 5", "6 1 2"))
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tk.MustQuery("execute stmt4 using @a").Check(testkit.Rows("4 4 4", "5 5 5", "6 1 2"))
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tk.MustExec(`prepare stmt5 from "select c from t order by c"`)
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tk.MustQuery("execute stmt5").Check(testkit.Rows("1", "2", "2", "3", "4", "5"))
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tk.MustQuery("execute stmt5").Check(testkit.Rows("1", "2", "2", "3", "4", "5"))
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tk.MustExec(`prepare stmt6 from "select distinct a from t order by a"`)
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tk.MustQuery("execute stmt6").Check(testkit.Rows("1", "2", "3", "4", "5", "6"))
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tk.MustQuery("execute stmt6").Check(testkit.Rows("1", "2", "3", "4", "5", "6"))
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}
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func (s *testPrepareSuite) TestPrepareCacheIndexScan(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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orgEnable := core.PreparedPlanCacheEnabled()
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orgCapacity := core.PreparedPlanCacheCapacity
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orgMemGuardRatio := core.PreparedPlanCacheMemoryGuardRatio
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orgMaxMemory := core.PreparedPlanCacheMaxMemory
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defer func() {
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dom.Close()
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store.Close()
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core.SetPreparedPlanCache(orgEnable)
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core.PreparedPlanCacheCapacity = orgCapacity
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core.PreparedPlanCacheMemoryGuardRatio = orgMemGuardRatio
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core.PreparedPlanCacheMaxMemory = orgMaxMemory
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}()
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core.SetPreparedPlanCache(true)
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core.PreparedPlanCacheCapacity = 100
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core.PreparedPlanCacheMemoryGuardRatio = 0.1
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// PreparedPlanCacheMaxMemory is set to MAX_UINT64 to make sure the cache
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// behavior would not be effected by the uncertain memory utilization.
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core.PreparedPlanCacheMaxMemory.Store(math.MaxUint64)
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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("create table t(a int, b int, c int, primary key (a, b))")
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tk.MustExec("insert into t values(1, 1, 2), (1, 2, 3), (1, 3, 3), (2, 1, 2), (2, 2, 3), (2, 3, 3)")
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tk.MustExec(`prepare stmt1 from "select a, c from t where a = ? and c = ?"`)
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tk.MustExec("set @a=1, @b=3")
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// When executing one statement at the first time, we don't use cache, so we need to execute it at least twice to test the cache.
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tk.MustQuery("execute stmt1 using @a, @b").Check(testkit.Rows("1 3", "1 3"))
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tk.MustQuery("execute stmt1 using @a, @b").Check(testkit.Rows("1 3", "1 3"))
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}
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func (s *testPlanSuite) TestPrepareCacheDeferredFunction(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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orgEnable := core.PreparedPlanCacheEnabled()
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orgCapacity := core.PreparedPlanCacheCapacity
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orgMemGuardRatio := core.PreparedPlanCacheMemoryGuardRatio
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orgMaxMemory := core.PreparedPlanCacheMaxMemory
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defer func() {
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dom.Close()
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store.Close()
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core.SetPreparedPlanCache(orgEnable)
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core.PreparedPlanCacheCapacity = orgCapacity
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core.PreparedPlanCacheMemoryGuardRatio = orgMemGuardRatio
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core.PreparedPlanCacheMaxMemory = orgMaxMemory
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}()
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core.SetPreparedPlanCache(true)
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core.PreparedPlanCacheCapacity = 100
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core.PreparedPlanCacheMemoryGuardRatio = 0.1
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// PreparedPlanCacheMaxMemory is set to MAX_UINT64 to make sure the cache
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// behavior would not be effected by the uncertain memory utilization.
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core.PreparedPlanCacheMaxMemory.Store(math.MaxUint64)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t1")
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tk.MustExec("create table t1 (id int PRIMARY KEY, c1 TIMESTAMP(3) NOT NULL DEFAULT '2019-01-14 10:43:20', KEY idx1 (c1))")
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tk.MustExec("prepare sel1 from 'select id, c1 from t1 where c1 < now(3)'")
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sql1 := "execute sel1"
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expectedPattern := `IndexReader\(Index\(t1.idx1\)\[\[-inf,[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1]) (2[0-3]|[01][0-9]):[0-5][0-9]:[0-5][0-9].[0-9][0-9][0-9]\)\]\)`
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var cnt [2]float64
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var planStr [2]string
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metrics.ResettablePlanCacheCounterFortTest = true
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metrics.PlanCacheCounter.Reset()
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counter := metrics.PlanCacheCounter.WithLabelValues("prepare")
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ctx := context.TODO()
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for i := 0; i < 2; i++ {
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stmt, err := s.ParseOneStmt(sql1, "", "")
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c.Check(err, IsNil)
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is := tk.Se.GetSessionVars().TxnCtx.InfoSchema.(infoschema.InfoSchema)
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builder := core.NewPlanBuilder(tk.Se, is, &core.BlockHintProcessor{})
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p, err := builder.Build(ctx, stmt)
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c.Check(err, IsNil)
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execPlan, ok := p.(*core.Execute)
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c.Check(ok, IsTrue)
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executor.ResetContextOfStmt(tk.Se, stmt)
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err = execPlan.OptimizePreparedPlan(ctx, tk.Se, is)
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c.Check(err, IsNil)
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planStr[i] = core.ToString(execPlan.Plan)
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c.Check(planStr[i], Matches, expectedPattern, Commentf("for %s", sql1))
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pb := &dto.Metric{}
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counter.Write(pb)
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cnt[i] = pb.GetCounter().GetValue()
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c.Check(cnt[i], Equals, float64(i))
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time.Sleep(time.Millisecond * 10)
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}
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c.Assert(planStr[0] < planStr[1], IsTrue, Commentf("plan 1: %v, plan 2: %v", planStr[0], planStr[1]))
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}
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func (s *testPrepareSuite) TestPrepareCacheNow(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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orgEnable := core.PreparedPlanCacheEnabled()
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orgCapacity := core.PreparedPlanCacheCapacity
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orgMemGuardRatio := core.PreparedPlanCacheMemoryGuardRatio
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orgMaxMemory := core.PreparedPlanCacheMaxMemory
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defer func() {
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dom.Close()
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store.Close()
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core.SetPreparedPlanCache(orgEnable)
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core.PreparedPlanCacheCapacity = orgCapacity
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core.PreparedPlanCacheMemoryGuardRatio = orgMemGuardRatio
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core.PreparedPlanCacheMaxMemory = orgMaxMemory
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}()
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core.SetPreparedPlanCache(true)
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core.PreparedPlanCacheCapacity = 100
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core.PreparedPlanCacheMemoryGuardRatio = 0.1
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// PreparedPlanCacheMaxMemory is set to MAX_UINT64 to make sure the cache
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// behavior would not be effected by the uncertain memory utilization.
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core.PreparedPlanCacheMaxMemory.Store(math.MaxUint64)
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tk.MustExec("use test")
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tk.MustExec(`prepare stmt1 from "select now(), current_timestamp(), utc_timestamp(), unix_timestamp(), sleep(0.1), now(), current_timestamp(), utc_timestamp(), unix_timestamp()"`)
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// When executing one statement at the first time, we don't usTestPrepareCacheDeferredFunctione cache, so we need to execute it at least twice to test the cache.
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_ = tk.MustQuery("execute stmt1").Rows()
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rs := tk.MustQuery("execute stmt1").Rows()
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c.Assert(rs[0][0].(string), Equals, rs[0][5].(string))
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c.Assert(rs[0][1].(string), Equals, rs[0][6].(string))
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c.Assert(rs[0][2].(string), Equals, rs[0][7].(string))
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c.Assert(rs[0][3].(string), Equals, rs[0][8].(string))
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}
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func (s *testPrepareSuite) TestPrepareOverMaxPreparedStmtCount(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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defer func() {
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dom.Close()
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store.Close()
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}()
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tk.MustExec("use test")
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// test prepare and deallocate.
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prePrepared := readGaugeInt(metrics.PreparedStmtGauge)
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tk.MustExec(`prepare stmt1 from "select 1"`)
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onePrepared := readGaugeInt(metrics.PreparedStmtGauge)
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c.Assert(prePrepared+1, Equals, onePrepared)
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tk.MustExec(`deallocate prepare stmt1`)
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deallocPrepared := readGaugeInt(metrics.PreparedStmtGauge)
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c.Assert(prePrepared, Equals, deallocPrepared)
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// test change global limit and make it affected in test session.
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tk.MustQuery("select @@max_prepared_stmt_count").Check(testkit.Rows("-1"))
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tk.MustExec("set @@global.max_prepared_stmt_count = 2")
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tk.MustQuery("select @@global.max_prepared_stmt_count").Check(testkit.Rows("2"))
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// Disable global variable cache, so load global session variable take effect immediate.
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dom.GetGlobalVarsCache().Disable()
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// test close session to give up all prepared stmt
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tk.MustExec(`prepare stmt2 from "select 1"`)
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prePrepared = readGaugeInt(metrics.PreparedStmtGauge)
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tk.Se.Close()
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drawPrepared := readGaugeInt(metrics.PreparedStmtGauge)
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c.Assert(prePrepared-1, Equals, drawPrepared)
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// test meet max limit.
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tk.Se = nil
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tk.MustQuery("select @@max_prepared_stmt_count").Check(testkit.Rows("2"))
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for i := 1; ; i++ {
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prePrepared = readGaugeInt(metrics.PreparedStmtGauge)
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if prePrepared >= 2 {
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_, err = tk.Exec(`prepare stmt` + strconv.Itoa(i) + ` from "select 1"`)
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c.Assert(terror.ErrorEqual(err, variable.ErrMaxPreparedStmtCountReached), IsTrue)
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break
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}
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tk.Exec(`prepare stmt` + strconv.Itoa(i) + ` from "select 1"`)
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}
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}
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// unit test for issue https://github.com/pingcap/tidb/issues/8518
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func (s *testPrepareSuite) TestPrepareTableAsNameOnGroupByWithCache(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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orgEnable := core.PreparedPlanCacheEnabled()
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orgCapacity := core.PreparedPlanCacheCapacity
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orgMemGuardRatio := core.PreparedPlanCacheMemoryGuardRatio
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orgMaxMemory := core.PreparedPlanCacheMaxMemory
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defer func() {
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dom.Close()
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store.Close()
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core.SetPreparedPlanCache(orgEnable)
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core.PreparedPlanCacheCapacity = orgCapacity
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core.PreparedPlanCacheMemoryGuardRatio = orgMemGuardRatio
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core.PreparedPlanCacheMaxMemory = orgMaxMemory
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}()
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core.SetPreparedPlanCache(true)
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core.PreparedPlanCacheCapacity = 100
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core.PreparedPlanCacheMemoryGuardRatio = 0.1
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// PreparedPlanCacheMaxMemory is set to MAX_UINT64 to make sure the cache
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// behavior would not be effected by the uncertain memory utilization.
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core.PreparedPlanCacheMaxMemory.Store(math.MaxUint64)
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tk.MustExec("use test")
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tk.MustExec("drop table if exists t1")
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tk.MustExec(`create table t1 (
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id int(11) unsigned not null primary key auto_increment,
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partner_id varchar(35) not null,
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t1_status_id int(10) unsigned
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);`)
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tk.MustExec(`insert into t1 values ("1", "partner1", "10"), ("2", "partner2", "10"), ("3", "partner3", "10"), ("4", "partner4", "10");`)
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tk.MustExec("drop table if exists t3")
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tk.MustExec(`create table t3 (
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id int(11) not null default '0',
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preceding_id int(11) not null default '0',
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primary key (id,preceding_id)
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);`)
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tk.MustExec(`prepare stmt from 'SELECT DISTINCT t1.partner_id
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FROM t1
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LEFT JOIN t3 ON t1.id = t3.id
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LEFT JOIN t1 pp ON pp.id = t3.preceding_id
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GROUP BY t1.id ;'`)
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tk.MustQuery("execute stmt").Sort().Check(testkit.Rows("partner1", "partner2", "partner3", "partner4"))
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}
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func readGaugeInt(g prometheus.Gauge) int {
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ch := make(chan prometheus.Metric, 1)
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g.Collect(ch)
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m := <-ch
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mm := &dto.Metric{}
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m.Write(mm)
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return int(mm.GetGauge().GetValue())
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}
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// unit test for issue https://github.com/pingcap/tidb/issues/9478
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func (s *testPrepareSuite) TestPrepareWithWindowFunction(c *C) {
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defer testleak.AfterTest(c)()
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store, dom, err := newStoreWithBootstrap()
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c.Assert(err, IsNil)
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tk := testkit.NewTestKit(c, store)
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defer func() {
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dom.Close()
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store.Close()
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}()
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tk.MustExec("set @@tidb_enable_window_function = 1")
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defer func() {
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tk.MustExec("set @@tidb_enable_window_function = 0")
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}()
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tk.MustExec("use test")
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tk.MustExec("create table window_prepare(a int, b double)")
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tk.MustExec("insert into window_prepare values(1, 1.1), (2, 1.9)")
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tk.MustExec("prepare stmt1 from 'select row_number() over() from window_prepare';")
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// Test the unnamed window can be executed successfully.
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tk.MustQuery("execute stmt1").Check(testkit.Rows("1", "2"))
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// Test the stmt can be prepared successfully.
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tk.MustExec("prepare stmt2 from 'select count(a) over (order by a rows between ? preceding and ? preceding) from window_prepare'")
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tk.MustExec("set @a=0, @b=1;")
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tk.MustQuery("execute stmt2 using @a, @b").Check(testkit.Rows("0", "0"))
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}
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