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plan: derive col is not null from col op col conditions
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Check whether the `op` condition is null rejected, if yes, derive
`col is not null` for both sides of inner join, and for inner side
of outer join.

Also, remove duplicate conditions before pushing them down. Check
if the condition is mutable before removing duplicates.

For AntiSemiJoin, AntiLeftOuterSemiJoin and LeftOuterSemiJoin, do
not generate new `is not null` conditions.
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@eurekaka
eurekaka committed Dec 27, 2018
1 parent 149b818 commit d61a4ef
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Showing 19 changed files with 506 additions and 221 deletions.
14 changes: 7 additions & 7 deletions cmd/explaintest/r/explain_complex.result
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Original file line number Diff line number Diff line change
Expand Up @@ -121,11 +121,11 @@ Projection_13 1.00 root gad.id, test.dd.id, gad.aid, gad.cm, test.dd.dic, test.d
└─IndexJoin_24 0.00 root inner join, inner:IndexLookUp_23, outer key:gad.aid, inner key:test.dd.aid, other cond:eq(test.dd.ip, gad.ip), gt(test.dd.t, gad.t)
├─IndexLookUp_23 0.00 root
│ ├─IndexScan_20 10.00 cop table:dd, index:aid, dic, range: decided by [gad.aid gad.ip], keep order:false, stats:pseudo
│ └─Selection_22 0.00 cop eq(test.dd.bm, 0), eq(test.dd.pt, "android"), gt(test.dd.t, 1478143908)
│ └─Selection_22 0.00 cop eq(test.dd.bm, 0), eq(test.dd.pt, "android"), gt(test.dd.t, 1478143908), not(isnull(test.dd.ip)), not(isnull(test.dd.t))
│ └─TableScan_21 10.00 cop table:dd, keep order:false, stats:pseudo
└─IndexLookUp_33 3.33 root
├─IndexScan_30 3333.33 cop table:gad, index:t, range:(1478143908,+inf], keep order:false, stats:pseudo
└─Selection_32 3.33 cop eq(gad.pt, "android")
└─Selection_32 3.33 cop eq(gad.pt, "android"), not(isnull(gad.ip))
└─TableScan_31 3333.33 cop table:st, keep order:false, stats:pseudo
explain select gad.id as gid,sdk.id as sid,gad.aid as aid,gad.cm as cm,sdk.dic as dic,sdk.ip as ip, sdk.t as t, gad.p1 as p1, gad.p2 as p2, gad.p3 as p3, gad.p4 as p4, gad.p5 as p5, gad.p6_md5 as p6, gad.p7_md5 as p7, gad.ext as ext from st gad join dd sdk on gad.aid = sdk.aid and gad.dic = sdk.mac and gad.t < sdk.t where gad.t > 1477971479 and gad.bm = 0 and gad.pt = 'ios' and gad.dit = 'mac' and sdk.t > 1477971479 and sdk.bm = 0 and sdk.pt = 'ios' limit 3000;
id count task operator info
Expand All @@ -134,11 +134,11 @@ Projection_10 0.00 root gad.id, sdk.id, gad.aid, gad.cm, sdk.dic, sdk.ip, sdk.t,
└─IndexJoin_18 0.00 root inner join, inner:IndexLookUp_17, outer key:gad.aid, inner key:sdk.aid, other cond:eq(gad.dic, sdk.mac), lt(gad.t, sdk.t)
├─IndexLookUp_27 0.00 root
│ ├─IndexScan_24 3333.33 cop table:gad, index:t, range:(1477971479,+inf], keep order:false, stats:pseudo
│ └─Selection_26 0.00 cop eq(gad.bm, 0), eq(gad.dit, "mac"), eq(gad.pt, "ios")
│ └─Selection_26 0.00 cop eq(gad.bm, 0), eq(gad.dit, "mac"), eq(gad.pt, "ios"), not(isnull(gad.dic))
│ └─TableScan_25 3333.33 cop table:st, keep order:false, stats:pseudo
└─IndexLookUp_17 0.00 root
├─IndexScan_14 10.00 cop table:sdk, index:aid, dic, range: decided by [gad.aid gad.dic], keep order:false, stats:pseudo
└─Selection_16 0.00 cop eq(sdk.bm, 0), eq(sdk.pt, "ios"), gt(sdk.t, 1477971479)
└─Selection_16 0.00 cop eq(sdk.bm, 0), eq(sdk.pt, "ios"), gt(sdk.t, 1477971479), not(isnull(sdk.mac)), not(isnull(sdk.t))
└─TableScan_15 10.00 cop table:dd, keep order:false, stats:pseudo
explain SELECT cm, p1, p2, p3, p4, p5, p6_md5, p7_md5, count(1) as click_pv, count(DISTINCT ip) as click_ip FROM st WHERE (t between 1478188800 and 1478275200) and aid='cn.sbkcq' and pt='android' GROUP BY cm, p1, p2, p3, p4, p5, p6_md5, p7_md5;
id count task operator info
Expand All @@ -153,9 +153,9 @@ id count task operator info
Projection_10 0.00 root dt.id, dt.aid, dt.pt, dt.dic, dt.cm, rr.gid, rr.acd, rr.t, dt.p1, dt.p2, dt.p3, dt.p4, dt.p5, dt.p6_md5, dt.p7_md5
└─Limit_13 0.00 root offset:0, count:2000
└─IndexJoin_19 0.00 root inner join, inner:IndexLookUp_18, outer key:dt.aid, dt.dic, inner key:rr.aid, rr.dic
├─TableReader_43 0.00 root data:Selection_42
│ └─Selection_42 0.00 cop eq(dt.bm, 0), eq(dt.pt, "ios"), gt(dt.t, 1478185592)
│ └─TableScan_41 10000.00 cop table:dt, range:[0,+inf], keep order:false, stats:pseudo
├─TableReader_45 0.00 root data:Selection_44
│ └─Selection_44 0.00 cop eq(dt.bm, 0), eq(dt.pt, "ios"), gt(dt.t, 1478185592), not(isnull(dt.dic))
│ └─TableScan_43 10000.00 cop table:dt, range:[0,+inf], keep order:false, stats:pseudo
└─IndexLookUp_18 3.33 root
├─IndexScan_15 10.00 cop table:rr, index:aid, dic, range: decided by [dt.aid dt.dic], keep order:false, stats:pseudo
└─Selection_17 3.33 cop eq(rr.pt, "ios"), gt(rr.t, 1478185592)
Expand Down
14 changes: 7 additions & 7 deletions cmd/explaintest/r/explain_complex_stats.result
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Original file line number Diff line number Diff line change
Expand Up @@ -130,23 +130,23 @@ Projection_13 424.00 root gad.id, test.dd.id, gad.aid, gad.cm, test.dd.dic, test
└─HashAgg_19 424.00 root group by:gad.aid, test.dd.dic, funcs:firstrow(gad.id), firstrow(gad.aid), firstrow(gad.cm), firstrow(gad.p1), firstrow(gad.p2), firstrow(gad.p3), firstrow(gad.p4), firstrow(gad.p5), firstrow(gad.p6_md5), firstrow(gad.p7_md5), firstrow(gad.ext), firstrow(gad.t), firstrow(test.dd.id), firstrow(test.dd.dic), firstrow(test.dd.ip), firstrow(test.dd.t)
└─IndexJoin_24 424.00 root inner join, inner:IndexLookUp_23, outer key:gad.aid, inner key:test.dd.aid, other cond:eq(gad.ip, test.dd.ip), gt(test.dd.t, gad.t)
├─TableReader_29 424.00 root data:Selection_28
│ └─Selection_28 424.00 cop eq(gad.bm, 0), eq(gad.pt, "android"), gt(gad.t, 1478143908)
│ └─Selection_28 424.00 cop eq(gad.bm, 0), eq(gad.pt, "android"), gt(gad.t, 1478143908), not(isnull(gad.ip))
│ └─TableScan_27 1999.00 cop table:gad, range:[0,+inf], keep order:false
└─IndexLookUp_23 455.80 root
├─IndexScan_20 1.00 cop table:dd, index:aid, dic, range: decided by [gad.aid gad.ip], keep order:false
└─Selection_22 455.80 cop eq(test.dd.bm, 0), eq(test.dd.pt, "android"), gt(test.dd.t, 1478143908)
└─Selection_22 455.80 cop eq(test.dd.bm, 0), eq(test.dd.pt, "android"), gt(test.dd.t, 1478143908), not(isnull(test.dd.ip)), not(isnull(test.dd.t))
└─TableScan_21 1.00 cop table:dd, keep order:false
explain select gad.id as gid,sdk.id as sid,gad.aid as aid,gad.cm as cm,sdk.dic as dic,sdk.ip as ip, sdk.t as t, gad.p1 as p1, gad.p2 as p2, gad.p3 as p3, gad.p4 as p4, gad.p5 as p5, gad.p6_md5 as p6, gad.p7_md5 as p7, gad.ext as ext from st gad join dd sdk on gad.aid = sdk.aid and gad.dic = sdk.mac and gad.t < sdk.t where gad.t > 1477971479 and gad.bm = 0 and gad.pt = 'ios' and gad.dit = 'mac' and sdk.t > 1477971479 and sdk.bm = 0 and sdk.pt = 'ios' limit 3000;
id count task operator info
Projection_10 170.34 root gad.id, sdk.id, gad.aid, gad.cm, sdk.dic, sdk.ip, sdk.t, gad.p1, gad.p2, gad.p3, gad.p4, gad.p5, gad.p6_md5, gad.p7_md5, gad.ext
└─Limit_13 170.34 root offset:0, count:3000
└─IndexJoin_18 170.34 root inner join, inner:IndexLookUp_17, outer key:gad.aid, inner key:sdk.aid, other cond:eq(gad.dic, sdk.mac), lt(gad.t, sdk.t)
├─TableReader_23 170.34 root data:Selection_22
│ └─Selection_22 170.34 cop eq(gad.bm, 0), eq(gad.dit, "mac"), eq(gad.pt, "ios"), gt(gad.t, 1477971479)
│ └─Selection_22 170.34 cop eq(gad.bm, 0), eq(gad.dit, "mac"), eq(gad.pt, "ios"), gt(gad.t, 1477971479), not(isnull(gad.dic))
│ └─TableScan_21 1999.00 cop table:gad, range:[0,+inf], keep order:false
└─IndexLookUp_17 509.04 root
├─IndexScan_14 1.00 cop table:sdk, index:aid, dic, range: decided by [gad.aid gad.dic], keep order:false
└─Selection_16 509.04 cop eq(sdk.bm, 0), eq(sdk.pt, "ios"), gt(sdk.t, 1477971479)
└─Selection_16 509.04 cop eq(sdk.bm, 0), eq(sdk.pt, "ios"), gt(sdk.t, 1477971479), not(isnull(sdk.mac)), not(isnull(sdk.t))
└─TableScan_15 1.00 cop table:dd, keep order:false
explain SELECT cm, p1, p2, p3, p4, p5, p6_md5, p7_md5, count(1) as click_pv, count(DISTINCT ip) as click_ip FROM st WHERE (t between 1478188800 and 1478275200) and aid='cn.sbkcq' and pt='android' GROUP BY cm, p1, p2, p3, p4, p5, p6_md5, p7_md5;
id count task operator info
Expand All @@ -161,9 +161,9 @@ id count task operator info
Projection_10 428.32 root dt.id, dt.aid, dt.pt, dt.dic, dt.cm, rr.gid, rr.acd, rr.t, dt.p1, dt.p2, dt.p3, dt.p4, dt.p5, dt.p6_md5, dt.p7_md5
└─Limit_13 428.32 root offset:0, count:2000
└─IndexJoin_19 428.32 root inner join, inner:IndexLookUp_18, outer key:dt.aid, dt.dic, inner key:rr.aid, rr.dic
├─TableReader_43 428.32 root data:Selection_42
│ └─Selection_42 428.32 cop eq(dt.bm, 0), eq(dt.pt, "ios"), gt(dt.t, 1478185592)
│ └─TableScan_41 2000.00 cop table:dt, range:[0,+inf], keep order:false
├─TableReader_45 428.32 root data:Selection_44
│ └─Selection_44 428.32 cop eq(dt.bm, 0), eq(dt.pt, "ios"), gt(dt.t, 1478185592), not(isnull(dt.dic))
│ └─TableScan_43 2000.00 cop table:dt, range:[0,+inf], keep order:false
└─IndexLookUp_18 970.00 root
├─IndexScan_15 1.00 cop table:rr, index:aid, dic, range: decided by [dt.aid dt.dic], keep order:false
└─Selection_17 970.00 cop eq(rr.pt, "ios"), gt(rr.t, 1478185592)
Expand Down
93 changes: 49 additions & 44 deletions cmd/explaintest/r/explain_easy.result
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Original file line number Diff line number Diff line change
Expand Up @@ -42,12 +42,13 @@ IndexReader_9 10.00 root index:IndexScan_8
└─IndexScan_8 10.00 cop table:t1, index:c2, range:[1,1], keep order:false, stats:pseudo
explain select * from t1 left join t2 on t1.c2 = t2.c1 where t1.c1 > 1;
id count task operator info
IndexJoin_11 4166.67 root left outer join, inner:IndexLookUp_10, outer key:test.t1.c2, inner key:test.t2.c1
├─TableReader_23 3333.33 root data:TableScan_22
│ └─TableScan_22 3333.33 cop table:t1, range:(1,+inf], keep order:false, stats:pseudo
└─IndexLookUp_10 10.00 root
├─IndexScan_8 10.00 cop table:t2, index:c1, range: decided by [test.t1.c2], keep order:false, stats:pseudo
└─TableScan_9 10.00 cop table:t2, keep order:false, stats:pseudo
IndexJoin_12 4166.67 root left outer join, inner:IndexLookUp_11, outer key:test.t1.c2, inner key:test.t2.c1
├─TableReader_24 3333.33 root data:TableScan_23
│ └─TableScan_23 3333.33 cop table:t1, range:(1,+inf], keep order:false, stats:pseudo
└─IndexLookUp_11 0.00 root
├─Selection_10 0.00 cop not(isnull(test.t2.c1))
│ └─IndexScan_8 10.00 cop table:t2, index:c1, range: decided by [test.t1.c2], keep order:false, stats:pseudo
└─TableScan_9 0.00 cop table:t2, keep order:false
explain update t1 set t1.c2 = 2 where t1.c1 = 1;
id count task operator info
Point_Get_1 1.00 root table:t1, handle:1
Expand All @@ -58,12 +59,13 @@ IndexLookUp_9 10.00 root
└─TableScan_8 10.00 cop table:t1, keep order:false, stats:pseudo
explain select count(b.c2) from t1 a, t2 b where a.c1 = b.c2 group by a.c1;
id count task operator info
Projection_11 10000.00 root cast(join_agg_0)
└─IndexJoin_14 10000.00 root inner join, inner:TableReader_13, outer key:b.c2, inner key:a.c1
├─HashAgg_21 8000.00 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_22 8000.00 root data:HashAgg_17
│ └─HashAgg_17 8000.00 cop group by:b.c2, funcs:count(b.c2), firstrow(b.c2)
│ └─TableScan_20 10000.00 cop table:b, range:[-inf,+inf], keep order:false, stats:pseudo
Projection_11 9990.00 root cast(join_agg_0)
└─IndexJoin_14 9990.00 root inner join, inner:TableReader_13, outer key:b.c2, inner key:a.c1
├─HashAgg_22 7992.00 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_23 7992.00 root data:HashAgg_17
│ └─HashAgg_17 7992.00 cop group by:b.c2, funcs:count(b.c2), firstrow(b.c2)
│ └─Selection_21 9990.00 cop not(isnull(b.c2))
│ └─TableScan_20 10000.00 cop table:b, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_13 10.00 root data:TableScan_12
└─TableScan_12 10.00 cop table:a, range: decided by [b.c2], keep order:false, stats:pseudo
explain select * from t2 order by t2.c2 limit 0, 1;
Expand Down Expand Up @@ -94,12 +96,13 @@ StreamAgg_12 1.00 root funcs:sum(5_aux_0)
└─IndexScan_22 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
explain select c1 from t1 where c1 in (select c2 from t2);
id count task operator info
Projection_9 10000.00 root test.t1.c1
└─IndexJoin_12 10000.00 root inner join, inner:TableReader_11, outer key:test.t2.c2, inner key:test.t1.c1
├─HashAgg_19 8000.00 root group by:col_1, funcs:firstrow(col_0)
│ └─TableReader_20 8000.00 root data:HashAgg_15
│ └─HashAgg_15 8000.00 cop group by:test.t2.c2, funcs:firstrow(test.t2.c2)
│ └─TableScan_18 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
Projection_9 9990.00 root test.t1.c1
└─IndexJoin_12 9990.00 root inner join, inner:TableReader_11, outer key:test.t2.c2, inner key:test.t1.c1
├─HashAgg_20 7992.00 root group by:col_1, funcs:firstrow(col_0)
│ └─TableReader_21 7992.00 root data:HashAgg_15
│ └─HashAgg_15 7992.00 cop group by:test.t2.c2, funcs:firstrow(test.t2.c2)
│ └─Selection_19 9990.00 cop not(isnull(test.t2.c2))
│ └─TableScan_18 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_11 10.00 root data:TableScan_10
└─TableScan_10 10.00 cop table:t1, range: decided by [test.t2.c2], keep order:false, stats:pseudo
explain select (select count(1) k from t1 s where s.c1 = t1.c1 having k != 0) from t1;
Expand Down Expand Up @@ -305,12 +308,13 @@ Projection_11 10000.00 root 9_aux_0
├─TableReader_15 10000.00 root data:TableScan_14
│ └─TableScan_14 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
└─StreamAgg_20 1.00 root funcs:count(1)
└─IndexJoin_33 12.50 root inner join, inner:TableReader_32, outer key:s.c, inner key:t1.a
├─IndexLookUp_38 10.00 root
│ ├─IndexScan_36 10.00 cop table:s, index:b, range: decided by [eq(s.b, test.t.a)], keep order:false, stats:pseudo
│ └─TableScan_37 10.00 cop table:t, keep order:false, stats:pseudo
└─TableReader_32 10.00 root data:TableScan_31
└─TableScan_31 10.00 cop table:t1, range: decided by [s.c], keep order:false, stats:pseudo
└─IndexJoin_34 12.49 root inner join, inner:TableReader_33, outer key:s.c, inner key:t1.a
├─IndexLookUp_40 9.99 root
│ ├─IndexScan_37 10.00 cop table:s, index:b, range: decided by [eq(s.b, test.t.a)], keep order:false, stats:pseudo
│ └─Selection_39 9.99 cop not(isnull(s.c))
│ └─TableScan_38 10.00 cop table:t, keep order:false, stats:pseudo
└─TableReader_33 10.00 root data:TableScan_32
└─TableScan_32 10.00 cop table:t1, range: decided by [s.c], keep order:false, stats:pseudo
drop table if exists t;
create table t(a int unsigned);
explain select t.a = '123455' from t;
Expand Down Expand Up @@ -356,13 +360,14 @@ id count task operator info
TableDual_5 0.00 root rows:0
explain select * from t t1 join t t2 where t1.b = t2.b and t2.b is null;
id count task operator info
Projection_7 12.50 root t1.a, t1.b, t2.a, t2.b
└─HashRightJoin_9 12.50 root inner join, inner:TableReader_12, equal:[eq(t2.b, t1.b)]
├─TableReader_12 10.00 root data:Selection_11
│ └─Selection_11 10.00 cop isnull(t2.b)
Projection_7 0.00 root t1.a, t1.b, t2.a, t2.b
└─HashRightJoin_9 0.00 root inner join, inner:TableReader_12, equal:[eq(t2.b, t1.b)]
├─TableReader_12 0.00 root data:Selection_11
│ └─Selection_11 0.00 cop isnull(t2.b), not(isnull(t2.b))
│ └─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_14 10000.00 root data:TableScan_13
└─TableScan_13 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_15 9990.00 root data:Selection_14
└─Selection_14 9990.00 cop not(isnull(t1.b))
└─TableScan_13 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
explain select * from t t1 where not exists (select * from t t2 where t1.b = t2.b);
id count task operator info
HashLeftJoin_9 8000.00 root anti semi join, inner:TableReader_13, equal:[eq(t1.b, t2.b)]
Expand Down Expand Up @@ -480,14 +485,14 @@ Projection_12 10000.00 root 9_aux_0
├─TableReader_16 10000.00 root data:TableScan_15
│ └─TableScan_15 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
└─HashAgg_19 1.00 root funcs:count(join_agg_0)
└─HashRightJoin_21 10.00 root inner join, inner:HashAgg_27, equal:[eq(t1.a, s.a)]
├─HashAgg_27 8.00 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_28 8.00 root data:HashAgg_22
│ └─HashAgg_22 8.00 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
│ └─Selection_26 10.00 cop eq(t1.a, test.t.a)
└─HashRightJoin_21 9.99 root inner join, inner:HashAgg_27, equal:[eq(t1.a, s.a)]
├─HashAgg_27 7.99 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_28 7.99 root data:HashAgg_22
│ └─HashAgg_22 7.99 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
│ └─Selection_26 9.99 cop eq(t1.a, test.t.a), not(isnull(t1.a))
│ └─TableScan_25 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_34 10.00 root data:Selection_33
└─Selection_33 10.00 cop eq(s.a, test.t.a)
└─TableReader_34 9.99 root data:Selection_33
└─Selection_33 9.99 cop eq(s.a, test.t.a), not(isnull(s.a))
└─TableScan_32 10000.00 cop table:s, range:[-inf,+inf], keep order:false, stats:pseudo
explain select * from t ta left outer join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(tb.a, 1) or tb.a is null;
id count task operator info
Expand All @@ -514,14 +519,14 @@ Projection_14 10000.00 root 9_aux_0
│ └─TableReader_19 10000.00 root data:TableScan_18
│ └─TableScan_18 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
└─HashAgg_23 1.00 root funcs:count(join_agg_0)
└─HashRightJoin_25 10.00 root inner join, inner:HashAgg_31, equal:[eq(t1.a, s.a)]
├─HashAgg_31 8.00 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_32 8.00 root data:HashAgg_26
│ └─HashAgg_26 8.00 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
│ └─Selection_30 10.00 cop eq(t1.a, test.t.a)
└─HashRightJoin_25 9.99 root inner join, inner:HashAgg_31, equal:[eq(t1.a, s.a)]
├─HashAgg_31 7.99 root group by:col_2, funcs:count(col_0), firstrow(col_1)
│ └─TableReader_32 7.99 root data:HashAgg_26
│ └─HashAgg_26 7.99 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
│ └─Selection_30 9.99 cop eq(t1.a, test.t.a), not(isnull(t1.a))
│ └─TableScan_29 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_38 10.00 root data:Selection_37
└─Selection_37 10.00 cop eq(s.a, test.t.a)
└─TableReader_38 9.99 root data:Selection_37
└─Selection_37 9.99 cop eq(s.a, test.t.a), not(isnull(s.a))
└─TableScan_36 10000.00 cop table:s, range:[-inf,+inf], keep order:false, stats:pseudo
drop table if exists t;
create table t(a int);
Expand Down
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