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

Jump to bottom

planner: not allow the optimizer to use json_contains(j, '[]') as access conditions on MVIndex #41013

Merged
merged 2 commits into from
Feb 3, 2023
Merged

planner: not allow the optimizer to use json_contains(j, '[]') as access conditions on MVIndex #41013

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
d5ae03e
fixup
qw4990 Feb 2, 2023
ab62491
Merge branch 'master' into mvindex-empty-array
qw4990 Feb 3, 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
4 changes: 2 additions & 2 deletions planner/core/indexmerge_path.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -668,7 +668,7 @@ func (ds *DataSource) buildPartialPaths4MVIndex(accessFilters []expression.Expre
case ast.JSONContains: // (json_contains(a->'$.zip', '[1, 2, 3]')
isIntersection = true
virColVals, ok = jsonArrayExpr2Exprs(ds.ctx, sf.GetArgs()[1], jsonType)
if !ok {
if !ok || len(virColVals) == 0 { // json_contains(JSON, '[]') is TRUE
return nil, false, false, nil
}
case ast.JSONOverlaps: // (json_overlaps(a->'$.zip', '[1, 2, 3]')
Expand All @@ -682,7 +682,7 @@ func (ds *DataSource) buildPartialPaths4MVIndex(accessFilters []expression.Expre
}
var ok bool
virColVals, ok = jsonArrayExpr2Exprs(ds.ctx, sf.GetArgs()[1-jsonPathIdx], jsonType)
if !ok {
if !ok || len(virColVals) == 0 { // forbid empty array for safety
return nil, false, false, nil
}
default:
Expand Down
38 changes: 36 additions & 2 deletions planner/core/indexmerge_path_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -302,6 +302,31 @@ func TestMVIndexFullScan(t *testing.T) {
tk.MustGetErrMsg(`select /*+ use_index(t, kj) */ count(*) from t`, "[planner:1815]Internal : Can't find a proper physical plan for this query")
}

func TestMVIndexEmptyArray(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("use test")
tk.MustExec(`create table t(j json, index kj((cast(j as signed array))))`)
tk.MustExec(`insert into t values ('[1]')`)
tk.MustExec(`insert into t values ('[1, 2]')`)
tk.MustExec(`insert into t values ('[]')`)
tk.MustExec(`insert into t values (NULL)`)

for _, cond := range []string{
"json_contains(j, '[]')",
"json_contains(j, '[1]')",
"json_contains(j, '[1, 2]')",
"json_contains(j, '[1, 10]')",
"json_overlaps(j, '[]')",
"json_overlaps(j, '[1]')",
"json_overlaps(j, '[1, 2]')",
"json_overlaps(j, '[1, 10]')",
} {
tk.MustQuery(fmt.Sprintf("select /*+ use_index_merge(t) */ * from t where %v", cond)).Sort().Check(
tk.MustQuery(fmt.Sprintf("select /*+ ignore_index(t, kj) */ * from t where %v", cond)).Sort().Rows())
}
}

func TestMVIndexRandom(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
Expand Down Expand Up @@ -364,14 +389,23 @@ func randMVIndexCond(condType int, valOpts randMVIndexValOpts) string {
case 0: // member_of
return fmt.Sprintf(`(%v member of (j))`, randMVIndexValue(valOpts))
case 1: // json_contains
return fmt.Sprintf(`json_contains(j, '[%v, %v]')`, randMVIndexValue(valOpts), randMVIndexValue(valOpts))
return fmt.Sprintf(`json_contains(j, '%v')`, randArray(valOpts))
case 2: // json_overlaps
return fmt.Sprintf(`json_overlaps(j, '[%v, %v]')`, randMVIndexValue(valOpts), randMVIndexValue(valOpts))
return fmt.Sprintf(`json_overlaps(j, '%v')`, randArray(valOpts))
default: // others
return fmt.Sprintf(`a < %v`, rand.Intn(valOpts.distinct))
}
}

func randArray(opts randMVIndexValOpts) string {
n := rand.Intn(5) // n can be 0
var vals []string
for i := 0; i < n; i++ {
vals = append(vals, randMVIndexValue(opts))
}
return "[" + strings.Join(vals, ", ") + "]"
}

type randMVIndexValOpts struct {
valType string // INT, UNSIGNED, STR, DATE
maxStrLen int
Expand Down