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planner: notify skyline pruning of index statistics availability #59110

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merged 3 commits into from
Jan 26, 2025
Merged

planner: notify skyline pruning of index statistics availability #59110

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planner: Ensure non-equal index without stats survives for skyling pr…
terry1purcell Jan 22, 2025
7401fb3
add testcases
terry1purcell Jan 22, 2025
bd6f4a7
review recommend to add comments
terry1purcell Jan 25, 2025
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add testcases
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@terry1purcell
terry1purcell committed Jan 22, 2025
commit 7401fb36df5ec18e40b39fe897636da5b618f4db
7 changes: 6 additions & 1 deletion pkg/planner/cardinality/selectivity_test.go
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Expand Up @@ -349,7 +349,7 @@ func TestNewIndexWithoutStats(t *testing.T) {
testKit := testkit.NewTestKit(t, store)
testKit.MustExec("use test")
testKit.MustExec("drop table if exists t")
testKit.MustExec("create table t(a int, b int, c int, index idxa(a))")
testKit.MustExec("create table t(a int, b int, c int, index idxa(a), index idxca(c,a))")
testKit.MustExec("set @@tidb_analyze_version=2")
testKit.MustExec("set @@global.tidb_enable_auto_analyze='OFF'")
testKit.MustExec("insert into t values (1, 1, 1)")
Expand All @@ -364,6 +364,11 @@ func TestNewIndexWithoutStats(t *testing.T) {
testKit.MustExec("create index idxab on t(a, b)")
// New index idxab should win due to having the most matching equal predicates - regardless of no statistics
testKit.MustQuery("explain format='brief' select * from t where a = 5 and b = 5").CheckContain("idxab(a, b)")
// New index idxab should win due to having the most predicates - regardless of no statistics
testKit.MustQuery("explain format='brief' select * from t where a > 5 and b > 5").CheckContain("idxab(a, b)")
testKit.MustQuery("explain format='brief' select * from t where a = 5 and b > 5 and c > 5").CheckContain("idxab(a, b)")
// New index idxab should NOT win because idxca has the same number of equals and has statistics
testKit.MustQuery("explain format='brief' select * from t where a = 5 and b > 5 and c = 5").CheckContain("idxca(c, a)")
}

func TestIssue57948(t *testing.T) {
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