This is an automated cherry-pick of pingcap#40686

Signed-off-by: ti-chi-bot <[email protected]>

expression/builtin_compare.go

@@ -1565,12 +1565,11 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 	arg0Type, arg1Type := args[0].GetType(), args[1].GetType()
 	arg0IsInt := arg0Type.EvalType() == types.ETInt
 	arg1IsInt := arg1Type.EvalType() == types.ETInt
-	arg0IsString := arg0Type.EvalType() == types.ETString
-	arg1IsString := arg1Type.EvalType() == types.ETString
 	arg0, arg0IsCon := args[0].(*Constant)
 	arg1, arg1IsCon := args[1].(*Constant)
 	isExceptional, finalArg0, finalArg1 := false, args[0], args[1]
 	isPositiveInfinite, isNegativeInfinite := false, false
+<<<<<<< HEAD
 	if MaybeOverOptimized4PlanCache(ctx, args) {
 		// To keep the result be compatible with MySQL, refine `int non-constant <cmp> str constant`
 		// here and skip this refine operation in all other cases for safety.
@@ -1589,8 +1588,15 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 		// We should remove the mutable constant for correctness, because its value may be changed.
 		RemoveMutableConst(ctx, args)
 	}
+=======
+>>>>>>> 465ab74532 (planner: skip the plan cache if non-int values are converted into int when optimization (#40686))
 	// int non-constant [cmp] non-int constant
 	if arg0IsInt && !arg0IsCon && !arg1IsInt && arg1IsCon {
+		if MaybeOverOptimized4PlanCache(ctx, []Expression{arg1}) {
+			ctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to INT", arg1.String()))
+			RemoveMutableConst(ctx, args)
+		}
+
 		arg1, isExceptional = RefineComparedConstant(ctx, *arg0Type, arg1, c.op)
 		// Why check not null flag
 		// eg: int_col > const_val(which is less than min_int32)
@@ -1618,6 +1624,11 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 	}
 	// non-int constant [cmp] int non-constant
 	if arg1IsInt && !arg1IsCon && !arg0IsInt && arg0IsCon {
+		if MaybeOverOptimized4PlanCache(ctx, []Expression{arg0}) {
+			ctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to INT", arg0.String()))
+			RemoveMutableConst(ctx, args)
+		}
+
 		arg0, isExceptional = RefineComparedConstant(ctx, *arg1Type, arg0, symmetricOp[c.op])
 		if !isExceptional || (isExceptional && mysql.HasNotNullFlag(arg1Type.GetFlag())) {
 			finalArg0 = arg0
@@ -1635,6 +1646,11 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 	}
 	// int constant [cmp] year type
 	if arg0IsCon && arg0IsInt && arg1Type.GetType() == mysql.TypeYear && !arg0.Value.IsNull() {
+		if MaybeOverOptimized4PlanCache(ctx, []Expression{arg0}) {
+			ctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to YEAR", arg0.String()))
+			RemoveMutableConst(ctx, args)
+		}
+
 		adjusted, failed := types.AdjustYear(arg0.Value.GetInt64(), false)
 		if failed == nil {
 			arg0.Value.SetInt64(adjusted)
@@ -1643,6 +1659,11 @@ func (c *compareFunctionClass) refineArgs(ctx sessionctx.Context, args []Express
 	}
 	// year type [cmp] int constant
 	if arg1IsCon && arg1IsInt && arg0Type.GetType() == mysql.TypeYear && !arg1.Value.IsNull() {
+		if MaybeOverOptimized4PlanCache(ctx, []Expression{arg1}) {
+			ctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to YEAR", arg1.String()))
+			RemoveMutableConst(ctx, args)
+		}
+
 		adjusted, failed := types.AdjustYear(arg1.Value.GetInt64(), false)
 		if failed == nil {
 			arg1.Value.SetInt64(adjusted)

planner/core/expression_rewriter.go

@@ -1559,9 +1559,14 @@ func (er *expressionRewriter) inToExpression(lLen int, not bool, tp *types.Field
 					} else {
 						continue
 					}
+<<<<<<< HEAD
 				} else if er.sctx.GetSessionVars().StmtCtx.SkipPlanCache {
 					// We should remove the mutable constant for correctness, because its value may be changed.
 					expression.RemoveMutableConst(er.sctx, []expression.Expression{c})
+=======
+					er.sctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to INT", c.String()))
+					expression.RemoveMutableConst(er.sctx, args)
+>>>>>>> 465ab74532 (planner: skip the plan cache if non-int values are converted into int when optimization (#40686))
 				}
 				args[i], isExceptional = expression.RefineComparedConstant(er.sctx, *leftFt, c, opcode.EQ)
 				if isExceptional {

planner/core/plan_cache_test.go

@@ -231,3 +231,130 @@ func TestPlanCacheDiagInfo(t *testing.T) {
 	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"))
 }
+<<<<<<< HEAD
+=======
+
+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"))
+}
+>>>>>>> 465ab74532 (planner: skip the plan cache if non-int values are converted into int when optimization (#40686))