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planner: add more test cases for non-prepared plan cache #41398

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merged 4 commits into from
Feb 14, 2023
Merged

planner: add more test cases for non-prepared plan cache #41398

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e437fdf
fixup
qw4990 Feb 14, 2023
3116ca3
fixup
qw4990 Feb 14, 2023
b652cd2
fixup
qw4990 Feb 14, 2023
2e7f811
fixup
qw4990 Feb 14, 2023
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117 changes: 117 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 @@ -102,6 +102,123 @@ func TestIssue40296(t *testing.T) {
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // unary operator '-' is not supported now.
}

func TestNonPreparedPlanCacheSchemaChange(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int)")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec("select * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

tk.MustExec("alter table t add index idx_a(a)")
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0")) // cannot hit since the schema changed
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedCacheWithPreparedCache(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int)")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec(`prepare st from 'select * from t where a=1'`)
tk.MustExec(`execute st`)
tk.MustExec(`execute st`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))

tk.MustExec(`select * from t where a=1`) // cannot hit since these 2 plan cache are separated
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheSwitch(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int)")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec(`select * from t where a=1`)
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustExec("set tidb_enable_non_prepared_plan_cache=0")
tk.MustExec(`select * from t where a=1`) // the session-level switch can take effect in real time
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
}

func TestNonPreparedPlanCacheSQLMode(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int)")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec(`select * from t where a=1`)
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustExec("set @@sql_mode=''") // cannot hit since sql-mode changed
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheStats(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int)")
tk.MustExec("insert into t values (2)")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec(`select * from t where a=1`)
tk.MustExec(`select * from t where a=1`)
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustExec("analyze table t")
tk.MustExec(`select * from t where a=1`) // stats changes won't affect non-prep cache hit
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheHints(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int, index(a))")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec("select /*+ use_index(t, a) */ * from t where a=1")
tk.MustExec("select /*+ use_index(t, a) */ * from t where a=1") // cannot hit since it has a hint
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))

tk.MustExec("select * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheBinding(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec(`use test`)
tk.MustExec("create table t(a int, index(a))")
tk.MustExec("set tidb_enable_non_prepared_plan_cache=1")

tk.MustExec("create binding for select * from t where a=1 using select /*+ use_index(t, a) */ * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("0"))
tk.MustExec("drop binding for select * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustExec("select * from t where a=1")
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
}

func TestNonPreparedPlanCacheWithExplain(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
Expand Down