Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

planner: skip plan-cache for prepared queries with INT in (Decimals...) (#40312) #40690

Merged
merged 5 commits into from
Mar 29, 2023
Merged

planner: skip plan-cache for prepared queries with INT in (Decimals...) (#40312) #40690

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
1537fe4
This is an automated cherry-pick of #40312
qw4990 Jan 5, 2023
f9146d0
fixup
qw4990 Mar 28, 2023
822828b
fixup
qw4990 Mar 28, 2023
6556273
fixup
qw4990 Mar 28, 2023
7a16051
fixup
qw4990 Mar 28, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
38 changes: 38 additions & 0 deletions executor/prepared_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,44 @@ func TestPreparedNullParam(t *testing.T) {
}
}

func TestIssue40224(t *testing.T) {
store, clean := testkit.CreateMockStore(t)
defer clean()

orgEnable := plannercore.PreparedPlanCacheEnabled()
defer func() {
plannercore.SetPreparedPlanCache(orgEnable)
}()
plannercore.SetPreparedPlanCache(true)
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.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.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 TestIssue29850(t *testing.T) {
store, clean := testkit.CreateMockStore(t)
defer clean()
Expand Down
12 changes: 3 additions & 9 deletions planner/core/expression_rewriter.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1485,16 +1485,10 @@ 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.SkipPlanCache = true
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.SkipPlanCache {
// We should remove the mutable constant for correctness, because its value may be changed.
er.sctx.GetSessionVars().StmtCtx.SkipPlanCache = true
expression.RemoveMutableConst(er.sctx, []expression.Expression{c})
}
args[i], isExceptional = expression.RefineComparedConstant(er.sctx, *leftFt, c, opcode.EQ)
Expand Down