// Copyright 2022 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package core_test

import (
	"context"
	"errors"
	"fmt"
	"math/rand"
	"strconv"
	"strings"
	"testing"

	"github.com/pingcap/tidb/expression"
	"github.com/pingcap/tidb/parser/mysql"
	plannercore "github.com/pingcap/tidb/planner/core"
	"github.com/pingcap/tidb/testkit"
	"github.com/pingcap/tidb/types"
	"github.com/pingcap/tidb/util"
	"github.com/stretchr/testify/require"
)

type mockParameterizer struct {
	action string
}

func (mp *mockParameterizer) Parameterize(originSQL string) (paramSQL string, params []expression.Expression, ok bool, err error) {
	switch mp.action {
	case "error":
		return "", nil, false, errors.New("error")
	case "not_support":
		return "", nil, false, nil
	}
	// only support SQL like 'select * from t where col {op} {int} and ...'
	prefix := "select * from t where "
	if !strings.HasPrefix(originSQL, prefix) {
		return "", nil, false, nil
	}
	buf := make([]byte, 0, 32)
	buf = append(buf, prefix...)
	for i, condStr := range strings.Split(originSQL[len(prefix):], "and") {
		if i > 0 {
			buf = append(buf, " and "...)
		}
		tmp := strings.Split(strings.TrimSpace(condStr), " ")
		if len(tmp) != 3 { // col {op} {val}
			return "", nil, false, nil
		}
		buf = append(buf, tmp[0]...)
		buf = append(buf, tmp[1]...)
		buf = append(buf, '?')

		intParam, err := strconv.Atoi(tmp[2])
		if err != nil {
			return "", nil, false, nil
		}
		params = append(params, &expression.Constant{Value: types.NewDatum(intParam), RetType: types.NewFieldType(mysql.TypeLong)})
	}
	return string(buf), params, true, nil
}

func TestInitLRUWithSystemVar(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("set @@session.tidb_prepared_plan_cache_size = 0") // MinValue: 1
	tk.MustQuery("select @@session.tidb_prepared_plan_cache_size").Check(testkit.Rows("1"))
	sessionVar := tk.Session().GetSessionVars()

	lru := plannercore.NewLRUPlanCache(uint(sessionVar.PreparedPlanCacheSize), 0, 0, tk.Session())
	require.NotNil(t, lru)
}

func TestIssue40296(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec(`create database test_40296`)
	tk.MustExec(`use test_40296`)
	tk.MustExec(`CREATE TABLE IDT_MULTI15880STROBJSTROBJ (
  COL1 enum('aa','bb','cc','dd','ff','gg','kk','ll','mm','ee') DEFAULT NULL,
  COL2 decimal(20,0) DEFAULT NULL,
  COL3 date DEFAULT NULL,
  KEY U_M_COL4 (COL1,COL2),
  KEY U_M_COL5 (COL3,COL2))`)
	tk.MustExec(`insert into IDT_MULTI15880STROBJSTROBJ values("ee", -9605492323393070105, "0850-03-15")`)
	tk.MustExec(`set session tidb_enable_non_prepared_plan_cache=on`)
	tk.MustQuery(`select * from IDT_MULTI15880STROBJSTROBJ where col1 in ("dd", "dd") or col2 = 9923875910817805958 or col3 = "9994-11-11"`).Check(
		testkit.Rows())
	tk.MustQuery(`select * from IDT_MULTI15880STROBJSTROBJ where col1 in ("aa", "aa") or col2 = -9605492323393070105 or col3 = "0005-06-22"`).Check(
		testkit.Rows("ee -9605492323393070105 0850-03-15"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // unary operator '-' is not supported now.
}

func TestNonPreparedPlanCacheWithExplain(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec(`use test`)
	tk.MustExec("create table t(a int)")
	tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")
	tk.MustExec("select * from t where a=1") // cache this plan

	tk.MustQuery("explain select * from t where a=2").Check(testkit.Rows(
		`Selection_8 10.00 root  eq(test.t.a, 2)`,
		`└─TableReader_7 10.00 root  data:Selection_6`,
		`  └─Selection_6 10.00 cop[tikv]  eq(test.t.a, 2)`,
		`    └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo`))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

	tk.MustQuery("explain format=verbose select * from t where a=2").Check(testkit.Rows(
		`Selection_8 10.00 169474.57 root  eq(test.t.a, 2)`,
		`└─TableReader_7 10.00 168975.57 root  data:Selection_6`,
		`  └─Selection_6 10.00 2534000.00 cop[tikv]  eq(test.t.a, 2)`,
		`    └─TableFullScan_5 10000.00 2035000.00 cop[tikv] table:t keep order:false, stats:pseudo`))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

	tk.MustQuery("explain analyze select * from t where a=2").CheckAt([]int{0, 1, 2, 3}, [][]interface{}{
		{"Selection_8", "10.00", "0", "root"},
		{"└─TableReader_7", "10.00", "0", "root"},
		{"  └─Selection_6", "10.00", "0", "cop[tikv]"},
		{"    └─TableFullScan_5", "10000.00", "0", "cop[tikv]"},
	})
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheFallback(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec(`use test`)
	tk.MustExec(`create table t (a int)`)
	for i := 0; i < 5; i++ {
		tk.MustExec(fmt.Sprintf("insert into t values (%v)", i))
	}
	tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

	// inject a fault to GeneratePlanCacheStmtWithAST
	ctx := context.WithValue(context.Background(), "____GeneratePlanCacheStmtWithASTErr", struct{}{})
	tk.MustQueryWithContext(ctx, "select * from t where a in (1, 2)").Sort().Check(testkit.Rows("1", "2"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // cannot generate PlanCacheStmt
	tk.MustQueryWithContext(ctx, "select * from t where a in (1, 3)").Sort().Check(testkit.Rows("1", "3"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // cannot generate PlanCacheStmt
	tk.MustQuery("select * from t where a in (1, 2)").Sort().Check(testkit.Rows("1", "2"))
	tk.MustQuery("select * from t where a in (1, 3)").Sort().Check(testkit.Rows("1", "3"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1")) // no error

	// inject a fault to GetPlanFromSessionPlanCache
	tk.MustQuery("select * from t where a=1").Check(testkit.Rows("1")) // cache this plan
	tk.MustQuery("select * from t where a=2").Check(testkit.Rows("2")) // plan from cache
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
	ctx = context.WithValue(context.Background(), "____GetPlanFromSessionPlanCacheErr", struct{}{})
	tk.MustQueryWithContext(ctx, "select * from t where a=3").Check(testkit.Rows("3"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // fallback to the normal opt-path
	tk.MustQueryWithContext(ctx, "select * from t where a=4").Check(testkit.Rows("4"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // fallback to the normal opt-path
	tk.MustQueryWithContext(context.Background(), "select * from t where a=0").Check(testkit.Rows("0"))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1")) // use the cached plan if no error

	// inject a fault to RestoreASTWithParams
	ctx = context.WithValue(context.Background(), "____GetPlanFromSessionPlanCacheErr", struct{}{})
	ctx = context.WithValue(ctx, "____RestoreASTWithParamsErr", struct{}{})
	_, err := tk.ExecWithContext(ctx, "select * from t where a=1")
	require.NotNil(t, err)
}

func TestNonPreparedPlanCacheBasically(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec(`use test`)
	tk.MustExec(`create table t (a int, b int, c int, d int, primary key(a), key(b), key(c, d))`)
	for i := 0; i < 20; i++ {
		tk.MustExec(fmt.Sprintf("insert into t values (%v, %v, %v, %v)", i, rand.Intn(20), rand.Intn(20), rand.Intn(20)))
	}

	queries := []string{
		"select * from t where a<10",
		"select * from t where a<13 and b<15",
		"select * from t where b=13",
		"select * from t where c<8",
		"select * from t where d>8",
		"select * from t where c=8 and d>10",
		"select * from t where a<12 and b<13 and c<12 and d>2",
	}

	for _, query := range queries {
		tk.MustExec(`set tidb_enable_non_prepared_plan_cache=0`)
		resultNormal := tk.MustQuery(query).Sort()
		tk.MustQuery(`select @@last_plan_from_cache`).Check(testkit.Rows("0"))

		tk.MustExec(`set tidb_enable_non_prepared_plan_cache=1`)
		tk.MustQuery(query)                                                    // first process
		tk.MustQuery(query).Sort().Check(resultNormal.Rows())                  // equal to the result without plan-cache
		tk.MustQuery(`select @@last_plan_from_cache`).Check(testkit.Rows("1")) // this plan is from plan-cache
	}
}

func TestIssue38269(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec(`set @@tidb_enable_prepared_plan_cache=1`)
	tk.MustExec("set @@tidb_enable_collect_execution_info=0")
	tk.MustExec("use test")
	tk.MustExec("create table t1(a int)")
	tk.MustExec("create table t2(a int, b int, c int, index idx(a, b))")
	tk.MustExec("prepare stmt1 from 'select /*+ inl_join(t2) */ * from t1 join t2 on t1.a = t2.a where t2.b in (?, ?, ?)'")
	tk.MustExec("set @a = 10, @b = 20, @c = 30, @d = 40, @e = 50, @f = 60")
	tk.MustExec("execute stmt1 using @a, @b, @c")
	tk.MustExec("execute stmt1 using @d, @e, @f")
	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})
	rows := tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).Rows()
	require.Contains(t, rows[6][4], "range: decided by [eq(test.t2.a, test.t1.a) in(test.t2.b, 40, 50, 60)]")
}

func TestIssue38533(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, key (a))")
	tk.MustExec(`prepare st from "select /*+ use_index(t, a) */ a from t where a=? and a=?"`)
	tk.MustExec(`set @a=1`)
	tk.MustExec(`execute st using @a, @a`)
	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})
	plan := tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).Rows()
	require.True(t, strings.Contains(plan[1][0].(string), "RangeScan")) // range-scan instead of full-scan

	tk.MustExec(`execute st using @a, @a`)
	tk.MustExec(`execute st using @a, @a`)
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestInvalidRange(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, key(a))")
	tk.MustExec("prepare st from 'select * from t where a>? and a<?'")
	tk.MustExec("set @l=100, @r=10")
	tk.MustExec("execute st using @l, @r")

	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})

	tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).CheckAt([]int{0},
		[][]interface{}{{"TableDual_5"}}) // use TableDual directly instead of TableFullScan

	tk.MustExec("execute st using @l, @r")
	tk.MustExec("execute st using @l, @r")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestIssue40093(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t1 (a int, b int)")
	tk.MustExec("create table t2 (a int, b int, key(b, a))")
	tk.MustExec("prepare st from 'select * from t1 left join t2 on t1.a=t2.a where t2.b in (?)'")
	tk.MustExec("set @b=1")
	tk.MustExec("execute st using @b")

	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})

	tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).CheckAt([]int{0},
		[][]interface{}{
			{"Projection_9"},
			{"└─HashJoin_21"},
			{"  ├─IndexReader_26(Build)"},
			{"  │ └─IndexRangeScan_25"}, // RangeScan instead of FullScan
			{"  └─TableReader_24(Probe)"},
			{"    └─Selection_23"},
			{"      └─TableFullScan_22"},
		})

	tk.MustExec("execute st using @b")
	tk.MustExec("execute st using @b")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestIssue38205(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("CREATE TABLE `item` (`id` int, `vid` varbinary(16), `sid` int)")
	tk.MustExec("CREATE TABLE `lv` (`item_id` int, `sid` int, KEY (`sid`,`item_id`))")

	tk.MustExec("prepare stmt from 'SELECT /*+ TIDB_INLJ(lv, item) */ * FROM lv LEFT JOIN item ON lv.sid = item.sid AND lv.item_id = item.id WHERE item.sid = ? AND item.vid IN (?, ?)'")
	tk.MustExec("set @a=1, @b='1', @c='3'")
	tk.MustExec("execute stmt using @a, @b, @c")

	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})

	tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).CheckAt([]int{0},
		[][]interface{}{
			{"IndexJoin_10"},
			{"├─TableReader_19(Build)"},
			{"│ └─Selection_18"},
			{"│   └─TableFullScan_17"}, // RangeScan instead of FullScan
			{"└─IndexReader_9(Probe)"},
			{"  └─Selection_8"},
			{"    └─IndexRangeScan_7"},
		})

	tk.MustExec("execute stmt using @a, @b, @c")
	tk.MustExec("execute stmt using @a, @b, @c")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestIgnoreInsertStmt(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int)")

	// do not cache native insert-stmt
	tk.MustExec("prepare st from 'insert into t values (1)'")
	tk.MustExec("execute st")
	tk.MustExec("execute st")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))

	// ignore-hint in insert-stmt can work
	tk.MustExec("prepare st from 'insert into t select * from t'")
	tk.MustExec("execute st")
	tk.MustExec("execute st")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
	tk.MustExec("prepare st from 'insert /*+ ignore_plan_cache() */ into t select * from t'")
	tk.MustExec("execute st")
	tk.MustExec("execute st")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestIssue38710(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("drop table if exists UK_NO_PRECISION_19392;")
	tk.MustExec("CREATE TABLE `UK_NO_PRECISION_19392` (\n  `COL1` bit(1) DEFAULT NULL,\n  `COL2` varchar(20) COLLATE utf8mb4_bin DEFAULT NULL,\n  `COL4` datetime DEFAULT NULL,\n  `COL3` bigint DEFAULT NULL,\n  `COL5` float DEFAULT NULL,\n  UNIQUE KEY `UK_COL1` (`COL1`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;")
	tk.MustExec("INSERT INTO `UK_NO_PRECISION_19392` VALUES (0x00,'缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈','9294-12-26 06:50:40',-3088380202191555887,-3.33294e38),(NULL,'仲膩蕦圓猴洠飌镂喵疎偌嫺荂踖Ƕ藨蜿諪軁笞','1746-08-30 18:04:04',-4016793239832666288,-2.52633e38),(0x01,'冑溜畁脊乤纊繳蟥哅稐奺躁悼貘飗昹槐速玃沮','1272-01-19 23:03:27',-8014797887128775012,1.48868e38);\n")
	tk.MustExec(`prepare stmt from 'select * from UK_NO_PRECISION_19392 where col1 between ? and ? or col3 = ? or col2 in (?, ?, ?);';`)
	tk.MustExec("set @a=0x01, @b=0x01, @c=-3088380202191555887, @d=\"缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈\", @e=\"缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈\", @f=\"缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈\";")
	rows := tk.MustQuery(`execute stmt using @a,@b,@c,@d,@e,@f;`) // can not be cached because @a = @b
	require.Equal(t, 2, len(rows.Rows()))

	tk.MustExec(`set @a=NULL, @b=NULL, @c=-4016793239832666288, @d="缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈", @e="仲膩蕦圓猴洠飌镂喵疎偌嫺荂踖Ƕ藨蜿諪軁笞", @f="缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈";`)
	rows = tk.MustQuery(`execute stmt using @a,@b,@c,@d,@e,@f;`)
	require.Equal(t, 2, len(rows.Rows()))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))

	rows = tk.MustQuery(`execute stmt using @a,@b,@c,@d,@e,@f;`)
	require.Equal(t, 2, len(rows.Rows()))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

	tk.MustExec(`set @a=0x01, @b=0x01, @c=-3088380202191555887, @d="缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈", @e="缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈", @f="缎馗惫砲兣肬憵急鳸嫅稩邏蠧鄂艘腯灩專妴粈";`)
	rows = tk.MustQuery(`execute stmt using @a,@b,@c,@d,@e,@f;`)
	require.Equal(t, 2, len(rows.Rows()))
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // can not use the cache because the types for @a and @b are not equal to the cached plan
}

func TestPlanCacheDiagInfo(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, b int, key(a), key(b))")

	tk.MustExec("prepare stmt from 'select * from t where a in (select a from t)'")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: query has sub-queries is un-cacheable"))

	tk.MustExec("prepare stmt from 'select /*+ ignore_plan_cache() */ * from t'")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: ignore plan cache by hint"))

	tk.MustExec("prepare stmt from 'select * from t order by ?'")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: query has 'order by ?' is un-cacheable"))

	tk.MustExec("prepare stmt from 'select * from t where a=?'")
	tk.MustExec("set @a='123'")
	tk.MustExec("execute stmt using @a") // '123' -> 123
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: '123' may be converted to INT"))

	tk.MustExec("prepare stmt from 'select * from t where a=? and a=?'")
	tk.MustExec("set @a=1, @b=1")
	tk.MustExec("execute stmt using @a, @b") // a=1 and a=1 -> a=1
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: some parameters may be overwritten"))
}

func TestIssue40224(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, key(a))")
	tk.MustExec("prepare st from 'select a from t where a in (?, ?)'")
	tk.MustExec("set @a=1.0, @b=2.0")
	tk.MustExec("execute st using @a, @b")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: '1.0' may be converted to INT"))
	tk.MustExec("execute st using @a, @b")
	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})
	tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).CheckAt([]int{0},
		[][]interface{}{
			{"IndexReader_6"},
			{"└─IndexRangeScan_5"}, // range scan not full scan
		})

	tk.MustExec("set @a=1, @b=2")
	tk.MustExec("execute st using @a, @b")
	tk.MustQuery("show warnings").Check(testkit.Rows()) // no warning for INT values
	tk.MustExec("execute st using @a, @b")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1")) // cacheable for INT
	tk.MustExec("execute st using @a, @b")
	tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).CheckAt([]int{0},
		[][]interface{}{
			{"IndexReader_6"},
			{"└─IndexRangeScan_5"}, // range scan not full scan
		})
}

func TestIssue40225(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, key(a))")
	tk.MustExec("prepare st from 'select * from t where a<?'")
	tk.MustExec("set @a='1'")
	tk.MustExec("execute st using @a")
	tk.MustQuery("show warnings").Sort().Check(testkit.Rows("Warning 1105 skip plan-cache: '1' may be converted to INT")) // plan-cache limitation
	tk.MustExec("create binding for select * from t where a<1 using select /*+ ignore_plan_cache() */ * from t where a<1")
	tk.MustExec("execute st using @a")
	tk.MustQuery("show warnings").Sort().Check(testkit.Rows("Warning 1105 skip plan-cache: ignore plan cache by binding"))
	// no warning about plan-cache limitations('1' -> INT) since plan-cache is totally disabled.

	tk.MustExec("prepare st from 'select * from t where a>?'")
	tk.MustExec("set @a=1")
	tk.MustExec("execute st using @a")
	tk.MustExec("execute st using @a")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
	tk.MustExec("create binding for select * from t where a>1 using select /*+ ignore_plan_cache() */ * from t where a>1")
	tk.MustExec("execute st using @a")
	tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
	tk.MustExec("execute st using @a")
	tk.MustQuery("select @@last_plan_from_binding").Check(testkit.Rows("1"))
}

func TestPlanCacheWithLimit(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("drop table if exists t")
	tk.MustExec("create table t(a int primary key, b int)")

	testCases := []struct {
		sql    string
		params []int
	}{
		{"prepare stmt from 'select * from t limit ?'", []int{1}},
		{"prepare stmt from 'select * from t limit ?, ?'", []int{1, 2}},
		{"prepare stmt from 'delete from t order by a limit ?'", []int{1}},
		{"prepare stmt from 'insert into t select * from t order by a desc limit ?'", []int{1}},
		{"prepare stmt from 'insert into t select * from t order by a desc limit ?, ?'", []int{1, 2}},
		{"prepare stmt from 'update t set a = 1 limit ?'", []int{1}},
		{"prepare stmt from '(select * from t order by a limit ?) union (select * from t order by a desc limit ?)'", []int{1, 2}},
		{"prepare stmt from 'select * from t where a = ? limit ?, ?'", []int{1, 1, 1}},
		{"prepare stmt from 'select * from t where a in (?, ?) limit ?, ?'", []int{1, 2, 1, 1}},
	}

	for idx, testCase := range testCases {
		tk.MustExec(testCase.sql)
		var using []string
		for i, p := range testCase.params {
			tk.MustExec(fmt.Sprintf("set @a%d = %d", i, p))
			using = append(using, fmt.Sprintf("@a%d", i))
		}

		tk.MustExec("execute stmt using " + strings.Join(using, ", "))
		tk.MustExec("execute stmt using " + strings.Join(using, ", "))
		tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

		if idx < 6 {
			tk.MustExec("set @a0 = 6")
			tk.MustExec("execute stmt using " + strings.Join(using, ", "))
			tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
		}
	}

	tk.MustExec("prepare stmt from 'select * from t limit ?'")
	tk.MustExec("set @a = 10001")
	tk.MustExec("execute stmt using @a")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: limit count more than 10000"))
}

func TestIssue40679(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("create table t (a int, key(a));")
	tk.MustExec("prepare st from 'select * from t use index(a) where a < ?'")
	tk.MustExec("set @a1=1.1")
	tk.MustExec("execute st using @a1")

	tkProcess := tk.Session().ShowProcess()
	ps := []*util.ProcessInfo{tkProcess}
	tk.Session().SetSessionManager(&testkit.MockSessionManager{PS: ps})
	rows := tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID)).Rows()
	require.True(t, strings.Contains(rows[1][0].(string), "RangeScan")) // RangeScan not FullScan

	tk.MustExec("execute st using @a1")
	tk.MustQuery("show warnings").Check(testkit.Rows("Warning 1105 skip plan-cache: '1.1' may be converted to INT"))
}