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planner: generate addition selection when plan cache enable #28457

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merged 17 commits into from
Sep 29, 2021
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planner: generate addition selection when plan cache enable #28457

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11face7
planner: generate addition selection when plan cache enable
Reminiscent Sep 28, 2021
298951a
Merge branch 'master' of github.com:pingcap/tidb into issue#28259
Reminiscent Sep 28, 2021
7112830
fix test cases
Reminiscent Sep 28, 2021
0331d5b
fix test cases
Reminiscent Sep 29, 2021
6e6f632
Merge branch 'master' of github.com:pingcap/tidb into issue#28259
Reminiscent Sep 29, 2021
1bbc58e
update the comments
Reminiscent Sep 29, 2021
45114d7
rename the keepAccessCondsAsFilter4PlanCache
Reminiscent Sep 29, 2021
dc760bd
add more test cases
Reminiscent Sep 29, 2021
d2caf20
fix test cases
Reminiscent Sep 29, 2021
4b3a03e
Merge branch 'master' of github.com:pingcap/tidb into issue#28259
Reminiscent Sep 29, 2021
711ad02
Merge branch 'master' into issue#28259
qw4990 Sep 29, 2021
df47299
add more comments
Reminiscent Sep 29, 2021
8a2c016
Merge branch 'master' of github.com:pingcap/tidb into issue#28259
Reminiscent Sep 29, 2021
c3f7997
Merge remote-tracking branch 'origin/issue#28259' into issue#28259
Reminiscent Sep 29, 2021
7f4dc35
update the comments
Reminiscent Sep 29, 2021
937a54b
add more test cases
Reminiscent Sep 29, 2021
6aaaf24
Merge branch 'master' of github.com:pingcap/tidb into issue#28259
Reminiscent Sep 29, 2021
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215 changes: 210 additions & 5 deletions executor/explainfor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -557,14 +557,219 @@ func (s *testPrepareSerialSuite) TestExpressionIndexPreparePlanCache(c *C) {
ps := []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res := tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[2][3], Matches, ".*expression_index.*")
c.Assert(res.Rows()[2][4], Matches, ".*[123,123].*")
c.Assert(len(res.Rows()), Equals, 5)
c.Assert(res.Rows()[3][3], Matches, ".*expression_index.*")
c.Assert(res.Rows()[3][4], Matches, ".*[123,123].*")

tk.MustExec("set @a = 1234")
tk.MustExec("execute stmt using @a")
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 5)
c.Assert(res.Rows()[3][3], Matches, ".*expression_index.*")
c.Assert(res.Rows()[3][4], Matches, ".*[1234,1234].*")
}

func (s *testPrepareSerialSuite) TestIssue28259(c *C) {
tk := testkit.NewTestKitWithInit(c, s.store)

orgEnable := core.PreparedPlanCacheEnabled()
defer func() {
core.SetPreparedPlanCache(orgEnable)
}()
core.SetPreparedPlanCache(true)

var err error
tk.Se, err = session.CreateSession4TestWithOpt(s.store, &session.Opt{
PreparedPlanCache: kvcache.NewSimpleLRUCache(100, 0.1, math.MaxUint64),
})
c.Assert(err, IsNil)

// test for indexRange
tk.MustExec("use test")
tk.MustExec("set @@tidb_enable_collect_execution_info=0;")
tk.MustExec("drop table if exists UK_GCOL_VIRTUAL_18588;")
tk.MustExec("CREATE TABLE `UK_GCOL_VIRTUAL_18588` (`COL1` bigint(20), UNIQUE KEY `UK_COL1` (`COL1`)" +
") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;")
tk.MustExec("insert into UK_GCOL_VIRTUAL_18588 values('8502658334322817163');")
tk.MustExec(`prepare stmt from 'select col1 from UK_GCOL_VIRTUAL_18588 where col1 between ? and ? or col1 < ?';`)
tk.MustExec("set @a=5516958330762833919, @b=8551969118506051323, @c=2887622822023883594;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows("8502658334322817163"))

tkProcess := tk.Se.ShowProcess()
ps := []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res := tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 3)
c.Assert(res.Rows()[1][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][0], Matches, ".*IndexRangeScan.*")

tk.MustExec("set @a=-1696020282760139948, @b=-2619168038882941276, @c=-4004648990067362699;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 3)
c.Assert(res.Rows()[1][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][0], Matches, ".*IndexFullScan.*")

res = tk.MustQuery("explain format = 'brief' select col1 from UK_GCOL_VIRTUAL_18588 use index(UK_COL1) " +
"where col1 between -1696020282760139948 and -2619168038882941276 or col1 < -4004648990067362699;")
c.Assert(len(res.Rows()), Equals, 3)
c.Assert(res.Rows()[1][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][0], Matches, ".*IndexFullScan.*")
res = tk.MustQuery("explain format = 'brief' select col1 from UK_GCOL_VIRTUAL_18588 use index(UK_COL1) " +
"where col1 between 5516958330762833919 and 8551969118506051323 or col1 < 2887622822023883594;")
c.Assert(len(res.Rows()), Equals, 2)
c.Assert(res.Rows()[1][0], Matches, ".*IndexRangeScan.*")

tk.MustExec("drop table if exists t;")
tk.MustExec("CREATE TABLE t (a int, b int, index idx(a, b));")
tk.MustExec("insert into t values(1, 0);")
tk.MustExec(`prepare stmt from 'select a from t where (a between ? and ? or a < ?) and b < 1;'`)
tk.MustExec("set @a=0, @b=2, @c=2;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows("1"))
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[2][3], Matches, ".*expression_index.*")
c.Assert(res.Rows()[2][4], Matches, ".*[1234,1234].*")
c.Assert(res.Rows()[1][0], Matches, ".*IndexReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1), or(and(ge(test.t.a, 0), le(test.t.a, 2)), lt(test.t.a, 2))")
c.Assert(res.Rows()[3][0], Matches, ".*IndexRangeScan.*")

tk.MustExec("set @a=2, @b=1, @c=1;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*IndexReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1), or(and(ge(test.t.a, 2), le(test.t.a, 1)), lt(test.t.a, 1))")
c.Assert(res.Rows()[3][0], Matches, ".*IndexFullScan.*")

res = tk.MustQuery("explain format = 'brief' select a from t use index(idx) " +
"where (a between 0 and 2 or a < 2) and b < 1;")
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*IndexReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1)")
c.Assert(res.Rows()[3][0], Matches, ".*IndexRangeScan.*")
res = tk.MustQuery("explain format = 'brief' select a from t use index(idx) " +
"where (a between 2 and 1 or a < 1) and b < 1;")
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*IndexReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1)")
c.Assert(res.Rows()[3][0], Matches, ".*IndexRangeScan.*")

// test for indexLookUp
tk.MustExec("drop table if exists t;")
tk.MustExec("CREATE TABLE t (a int, b int, index idx(a));")
tk.MustExec("insert into t values(1, 0);")
tk.MustExec(`prepare stmt from 'select a from t where (a between ? and ? or a < ?) and b < 1;'`)
tk.MustExec("set @a=0, @b=2, @c=2;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows("1"))
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 6)
c.Assert(res.Rows()[1][0], Matches, ".*IndexLookUp.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[3][0], Matches, ".*IndexRangeScan.*")

tk.MustExec("set @a=2, @b=1, @c=1;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 6)
c.Assert(res.Rows()[1][0], Matches, ".*IndexLookUp.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[3][0], Matches, ".*IndexFullScan.*")

res = tk.MustQuery("explain format = 'brief' select a from t use index(idx) " +
"where (a between 0 and 2 or a < 2) and b < 1;")
c.Assert(len(res.Rows()), Equals, 5)
c.Assert(res.Rows()[1][0], Matches, ".*IndexLookUp.*")
c.Assert(res.Rows()[2][0], Matches, ".*IndexRangeScan.*")
res = tk.MustQuery("explain format = 'brief' select a from t use index(idx) " +
"where (a between 2 and 1 or a < 1) and b < 1;")
c.Assert(len(res.Rows()), Equals, 5)
c.Assert(res.Rows()[1][0], Matches, ".*IndexLookUp.*")
c.Assert(res.Rows()[2][0], Matches, ".*IndexRangeScan.*")

// test for tableReader
tk.MustExec("drop table if exists t;")
tk.MustExec("CREATE TABLE t (a int PRIMARY KEY CLUSTERED, b int);")
tk.MustExec("insert into t values(1, 0);")
tk.MustExec(`prepare stmt from 'select a from t where (a between ? and ? or a < ?) and b < 1;'`)
tk.MustExec("set @a=0, @b=2, @c=2;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows("1"))
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*TableReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1), or(and(ge(test.t.a, 0), le(test.t.a, 2)), lt(test.t.a, 2))")
c.Assert(res.Rows()[3][0], Matches, ".*TableRangeScan.*")

tk.MustExec("set @a=2, @b=1, @c=1;")
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tk.MustQuery("select @@last_plan_from_cache").Check(testkit.Rows("1"))
tk.MustQuery("execute stmt using @a,@b,@c;").Check(testkit.Rows())
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*TableReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1), or(and(ge(test.t.a, 2), le(test.t.a, 1)), lt(test.t.a, 1))")
c.Assert(res.Rows()[3][0], Matches, ".*TableRangeScan.*")

res = tk.MustQuery("explain format = 'brief' select a from t " +
"where (a between 0 and 2 or a < 2) and b < 1;")
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*TableReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1)")
c.Assert(res.Rows()[3][0], Matches, ".*TableRangeScan.*")
res = tk.MustQuery("explain format = 'brief' select a from t " +
"where (a between 2 and 1 or a < 1) and b < 1;")
c.Assert(len(res.Rows()), Equals, 4)
c.Assert(res.Rows()[1][0], Matches, ".*TableReader.*")
c.Assert(res.Rows()[2][0], Matches, ".*Selection.*")
c.Assert(res.Rows()[2][4], Equals, "lt(test.t.b, 1)")
c.Assert(res.Rows()[3][0], Matches, ".*TableRangeScan.*")

tk.MustExec("drop table if exists t;")
tk.MustExec("CREATE TABLE t (a int primary key, b int, c int, d int);")
tk.MustExec(`prepare stmt from 'select * from t where ((a > ? and a < 5 and b > 2) or (a > ? and a < 10 and c > 3)) and d = 5;';`)
tk.MustExec("set @a=1, @b=8;")
tk.MustQuery("execute stmt using @a,@b;").Check(testkit.Rows())
tkProcess = tk.Se.ShowProcess()
ps = []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
res = tk.MustQuery("explain for connection " + strconv.FormatUint(tkProcess.ID, 10))
c.Assert(len(res.Rows()), Equals, 3)
c.Assert(res.Rows()[0][0], Matches, ".*TableReader.*")
c.Assert(res.Rows()[1][0], Matches, ".*Selection.*")
// The duplicate expressions can not be eliminated because the conditions are not the same.
// So this may be a bad case in some situations.
c.Assert(res.Rows()[1][4], Equals, "eq(test.t.d, 5), or(and(gt(test.t.a, 1), and(lt(test.t.a, 5), gt(test.t.b, 2))), and(gt(test.t.a, 8), and(lt(test.t.a, 10), gt(test.t.c, 3)))), or(and(gt(test.t.a, 1), lt(test.t.a, 5)), and(gt(test.t.a, 8), lt(test.t.a, 10)))")
c.Assert(res.Rows()[2][0], Matches, ".*TableRangeScan.*")
}
11 changes: 7 additions & 4 deletions executor/prepared_test.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -613,15 +613,17 @@ func (s *testSerialSuite) TestIssue28064(c *C) {
"`d` decimal(10,0) DEFAULT NULL," +
"KEY `iabc` (`a`,`b`,`c`));")
tk.MustExec("set @a='123', @b='234', @c='345';")
tk.MustExec("set @@tidb_enable_collect_execution_info=0;")
tk.MustExec("prepare stmt1 from 'select * from t28064 use index (iabc) where a = ? and b = ? and c = ?';")

tk.MustExec("execute stmt1 using @a, @b, @c;")
tkProcess := tk.Se.ShowProcess()
ps := []*util.ProcessInfo{tkProcess}
tk.Se.SetSessionManager(&mockSessionManager1{PS: ps})
rows := tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID))
rows.Check(testkit.Rows("IndexLookUp_7 0.00 root ",
"├─IndexRangeScan_5(Build) 0.00 cop[tikv] table:t28064, index:iabc(a, b, c) range:[123 234 345,123 234 345], keep order:false, stats:pseudo",
rows.Check(testkit.Rows("IndexLookUp_8 0.00 root ",
"├─Selection_7(Build) 0.00 cop[tikv] eq(test.t28064.a, 123), eq(test.t28064.b, 234), eq(test.t28064.c, 345)",
"│ └─IndexRangeScan_5 0.00 cop[tikv] table:t28064, index:iabc(a, b, c) range:[123 234 345,123 234 345], keep order:false, stats:pseudo",
"└─TableRowIDScan_6(Probe) 0.00 cop[tikv] table:t28064 keep order:false, stats:pseudo"))

tk.MustExec("execute stmt1 using @a, @b, @c;")
Expand All @@ -630,7 +632,8 @@ func (s *testSerialSuite) TestIssue28064(c *C) {

tk.MustExec("execute stmt1 using @a, @b, @c;")
rows = tk.MustQuery(fmt.Sprintf("explain for connection %d", tkProcess.ID))
rows.Check(testkit.Rows("IndexLookUp_7 0.00 root ",
"├─IndexRangeScan_5(Build) 0.00 cop[tikv] table:t28064, index:iabc(a, b, c) range:[123 234 345,123 234 345], keep order:false, stats:pseudo",
rows.Check(testkit.Rows("IndexLookUp_8 0.00 root ",
"├─Selection_7(Build) 0.00 cop[tikv] eq(test.t28064.a, 123), eq(test.t28064.b, 234), eq(test.t28064.c, 345)",
"│ └─IndexRangeScan_5 0.00 cop[tikv] table:t28064, index:iabc(a, b, c) range:[123 234 345,123 234 345], keep order:false, stats:pseudo",
"└─TableRowIDScan_6(Probe) 0.00 cop[tikv] table:t28064 keep order:false, stats:pseudo"))
}
23 changes: 13 additions & 10 deletions executor/testdata/prepare_suite_out.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -83,8 +83,9 @@
],
"Plan": [
"Projection_4 10.00 root test.t1.a",
"└─IndexReader_6 10.00 root index:IndexRangeScan_5",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[3,3], keep order:false, stats:pseudo"
"└─IndexReader_7 0.00 root index:Selection_6",
" └─Selection_6 0.00 cop[tikv] eq(test.t1.b, 3)",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[3,3], keep order:false, stats:pseudo"
],
"LastPlanUseCache": "0",
"Result": [
Expand All @@ -101,8 +102,9 @@
],
"Plan": [
"Projection_4 10.00 root test.t1.a",
"└─IndexReader_6 10.00 root index:IndexRangeScan_5",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[2,2], keep order:false, stats:pseudo"
"└─IndexReader_7 0.00 root index:Selection_6",
" └─Selection_6 0.00 cop[tikv] eq(test.t1.b, 2)",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[2,2], keep order:false, stats:pseudo"
],
"LastPlanUseCache": "1",
"Result": [
Expand All @@ -119,8 +121,9 @@
],
"Plan": [
"Projection_4 10.00 root test.t1.a",
"└─IndexReader_6 10.00 root index:IndexRangeScan_5",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[-200,-200], keep order:false, stats:pseudo"
"└─IndexReader_7 0.00 root index:Selection_6",
" └─Selection_6 0.00 cop[tikv] eq(test.t1.b, -200)",
" └─IndexRangeScan_5 10.00 cop[tikv] table:t1, index:b(b, a) range:[-200,-200], keep order:false, stats:pseudo"
],
"LastPlanUseCache": "1",
"Result": null
Expand Down Expand Up @@ -158,11 +161,11 @@
"Plan": [
"HashJoin_38 6387.21 root inner join, equal:[eq(test.t1.b, test.t2.b) eq(test.t1.a, test.t2.a)]",
"├─IndexLookUp_63(Build) 99.80 root ",
"│ ├─Selection_62(Build) 99.80 cop[tikv] not(isnull(test.t2.b))",
"│ ├─Selection_62(Build) 99.80 cop[tikv] eq(test.t2.b, 1), not(isnull(test.t2.a)), not(isnull(test.t2.b))",
"│ │ └─IndexRangeScan_60 99.90 cop[tikv] table:t2, index:b(b, a) range:[1 -inf,1 +inf], keep order:false, stats:pseudo",
"│ └─TableRowIDScan_61(Probe) 99.80 cop[tikv] table:t2 keep order:false, stats:pseudo",
"└─IndexLookUp_56(Probe) 99.80 root ",
" ├─Selection_55(Build) 99.80 cop[tikv] not(isnull(test.t1.b))",
" ├─Selection_55(Build) 99.80 cop[tikv] eq(test.t1.b, 1), not(isnull(test.t1.a)), not(isnull(test.t1.b))",
" │ └─IndexRangeScan_53 99.90 cop[tikv] table:t1, index:b(b, a) range:[1 -inf,1 +inf], keep order:false, stats:pseudo",
" └─TableRowIDScan_54(Probe) 99.80 cop[tikv] table:t1 keep order:false, stats:pseudo"
],
Expand All @@ -180,11 +183,11 @@
"Plan": [
"HashJoin_38 6387.21 root inner join, equal:[eq(test.t1.b, test.t2.b) eq(test.t1.a, test.t2.a)]",
"├─IndexLookUp_63(Build) 99.80 root ",
"│ ├─Selection_62(Build) 99.80 cop[tikv] not(isnull(test.t2.b))",
"│ ├─Selection_62(Build) 99.80 cop[tikv] eq(test.t2.b, 2), not(isnull(test.t2.a)), not(isnull(test.t2.b))",
"│ │ └─IndexRangeScan_60 99.90 cop[tikv] table:t2, index:b(b, a) range:[2 -inf,2 +inf], keep order:false, stats:pseudo",
"│ └─TableRowIDScan_61(Probe) 99.80 cop[tikv] table:t2 keep order:false, stats:pseudo",
"└─IndexLookUp_56(Probe) 99.80 root ",
" ├─Selection_55(Build) 99.80 cop[tikv] not(isnull(test.t1.b))",
" ├─Selection_55(Build) 99.80 cop[tikv] eq(test.t1.b, 2), not(isnull(test.t1.a)), not(isnull(test.t1.b))",
" │ └─IndexRangeScan_53 99.90 cop[tikv] table:t1, index:b(b, a) range:[2 -inf,2 +inf], keep order:false, stats:pseudo",
" └─TableRowIDScan_54(Probe) 99.80 cop[tikv] table:t1 keep order:false, stats:pseudo"
],
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