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planner: skip plan-cache for prepared queries with INT in (Decimals...) #40312

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merged 4 commits into from
Jan 5, 2023
Merged

planner: skip plan-cache for prepared queries with INT in (Decimals...) #40312

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81f7fd5
fixup
qw4990 Jan 4, 2023
35dc73b
fixup
qw4990 Jan 4, 2023
018935e
Merge branch 'master' into fix-40224
qw4990 Jan 4, 2023
e4a8ac2
Merge branch 'master' into fix-40224
ti-chi-bot Jan 5, 2023
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12 changes: 3 additions & 9 deletions planner/core/expression_rewriter.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1559,16 +1559,10 @@ func (er *expressionRewriter) inToExpression(lLen int, not bool, tp *types.Field
if c, ok := args[i].(*expression.Constant); ok {
var isExceptional bool
if expression.MaybeOverOptimized4PlanCache(er.sctx, []expression.Expression{c}) {
if c.GetType().EvalType() == types.ETString {
// 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.
er.sctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to INT", c.String()))
expression.RemoveMutableConst(er.sctx, []expression.Expression{c})
} else {
continue
if c.GetType().EvalType() == types.ETInt {
continue // no need to refine it
}
} else if !er.sctx.GetSessionVars().StmtCtx.UseCache {
// We should remove the mutable constant for correctness, because its value may be changed.
er.sctx.GetSessionVars().StmtCtx.SetSkipPlanCache(errors.Errorf("skip plan-cache: '%v' may be converted to INT", c.String()))
expression.RemoveMutableConst(er.sctx, []expression.Expression{c})
}
args[i], isExceptional = expression.RefineComparedConstant(er.sctx, *leftFt, c, opcode.EQ)
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32 changes: 32 additions & 0 deletions planner/core/plan_cache_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -385,6 +385,38 @@ func TestPlanCacheDiagInfo(t *testing.T) {
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)
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