133 lines
4.7 KiB
Go
133 lines
4.7 KiB
Go
// Copyright 2022 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package core_test
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import (
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"errors"
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"fmt"
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"math/rand"
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"strconv"
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"strings"
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"testing"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/parser/mysql"
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plannercore "github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/testkit"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util"
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"github.com/stretchr/testify/require"
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)
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type mockParameterizer struct {
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action string
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}
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func (mp *mockParameterizer) Parameterize(originSQL string) (paramSQL string, params []expression.Expression, ok bool, err error) {
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switch mp.action {
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case "error":
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return "", nil, false, errors.New("error")
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case "not_support":
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return "", nil, false, nil
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}
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// only support SQL like 'select * from t where col {op} {int} and ...'
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prefix := "select * from t where "
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if !strings.HasPrefix(originSQL, prefix) {
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return "", nil, false, nil
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}
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buf := make([]byte, 0, 32)
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buf = append(buf, prefix...)
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for i, condStr := range strings.Split(originSQL[len(prefix):], "and") {
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if i > 0 {
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buf = append(buf, " and "...)
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}
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tmp := strings.Split(strings.TrimSpace(condStr), " ")
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if len(tmp) != 3 { // col {op} {val}
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return "", nil, false, nil
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}
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buf = append(buf, tmp[0]...)
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buf = append(buf, tmp[1]...)
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buf = append(buf, '?')
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intParam, err := strconv.Atoi(tmp[2])
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if err != nil {
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return "", nil, false, nil
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}
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params = append(params, &expression.Constant{Value: types.NewDatum(intParam), RetType: types.NewFieldType(mysql.TypeLong)})
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}
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return string(buf), params, true, nil
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}
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func TestInitLRUWithSystemVar(t *testing.T) {
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store := testkit.CreateMockStore(t)
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tk := testkit.NewTestKit(t, store)
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tk.MustExec("set @@session.tidb_prepared_plan_cache_size = 0") // MinValue: 1
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tk.MustQuery("select @@session.tidb_prepared_plan_cache_size").Check(testkit.Rows("1"))
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sessionVar := tk.Session().GetSessionVars()
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lru := plannercore.NewLRUPlanCache(uint(sessionVar.PreparedPlanCacheSize), 0, 0, plannercore.PickPlanFromBucket)
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require.NotNil(t, lru)
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}
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func TestGeneralPlanCacheBasically(t *testing.T) {
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store := testkit.CreateMockStore(t)
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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, c int, d int, primary key(a), key(b), key(c, d))`)
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for i := 0; i < 20; i++ {
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tk.MustExec(fmt.Sprintf("insert into t values (%v, %v, %v, %v)", i, rand.Intn(20), rand.Intn(20), rand.Intn(20)))
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}
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queries := []string{
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"select * from t where a<10",
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"select * from t where a<13 and b<15",
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"select * from t where b=13",
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"select * from t where c<8",
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"select * from t where d>8",
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"select * from t where c=8 and d>10",
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"select * from t where a<12 and b<13 and c<12 and d>2",
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}
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for _, query := range queries {
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tk.MustExec(`set tidb_enable_general_plan_cache=0`)
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resultNormal := tk.MustQuery(query).Sort()
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tk.MustQuery(`select @@last_plan_from_cache`).Check(testkit.Rows("0"))
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tk.MustExec(`set tidb_enable_general_plan_cache=1`)
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tk.MustQuery(query) // first process
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tk.MustQuery(query).Sort().Check(resultNormal.Rows()) // equal to the result without plan-cache
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tk.MustQuery(`select @@last_plan_from_cache`).Check(testkit.Rows("1")) // this plan is from plan-cache
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}
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}
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func TestIssue38269(t *testing.T) {
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store := testkit.CreateMockStore(t)
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tk := testkit.NewTestKit(t, store)
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tk.MustExec(`set @@tidb_enable_prepared_plan_cache=1`)
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tk.MustExec("set @@tidb_enable_collect_execution_info=0")
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tk.MustExec("use test")
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tk.MustExec("create table t1(a int)")
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tk.MustExec("create table t2(a int, b int, c int, index idx(a, b))")
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tk.MustExec("prepare stmt1 from 'select /*+ inl_join(t2) */ * from t1 join t2 on t1.a = t2.a where t2.b in (?, ?, ?)'")
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tk.MustExec("set @a = 10, @b = 20, @c = 30, @d = 40, @e = 50, @f = 60")
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tk.MustExec("execute stmt1 using @a, @b, @c")
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tk.MustExec("execute stmt1 using @d, @e, @f")
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tkProcess := tk.Session().ShowProcess()
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ps := []*util.ProcessInfo{tkProcess}
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tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})
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rows := tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).Rows()
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require.Contains(t, rows[6][4], "range: decided by [eq(test.t2.a, test.t1.a) in(test.t2.b, 40, 50, 60)]")
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}
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