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plan: convert in subquery to agg and inner join #7531

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Oct 30, 2018
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plan: convert in subquery to agg and inner join #7531

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e82e83e
plan: convert in subquery to agg and inner join
winoros Aug 28, 2018
4cac41f
Modify rule. So it won't be worse than before.
winoros Aug 29, 2018
6c06056
rename the variable
winoros Aug 29, 2018
7b22605
fix the unit tests.
winoros Aug 29, 2018
500b54a
add new rule to eliminate agg by key.
winoros Aug 29, 2018
62705f6
fix explain test.
winoros Aug 29, 2018
9f1a980
variable is not initialized in session.
winoros Aug 29, 2018
72ff6ad
modify tpch comment.
winoros Aug 29, 2018
31372da
add comment.
winoros Aug 29, 2018
48018ff
fix comment
winoros Aug 29, 2018
8c8ed42
fix gofmt.
winoros Aug 29, 2018
9073856
Merge branch 'master' into insubq-to-agg-and-join
winoros Aug 29, 2018
0c5dd50
Merge branch 'master' into insubq-to-agg-and-join
winoros Sep 12, 2018
81ba7ec
extract same part into struct
winoros Sep 12, 2018
d21347b
rename variable
winoros Sep 12, 2018
1d5523c
fix test
winoros Sep 12, 2018
f40d376
Merge branch 'master' into insubq-to-agg-and-join
winoros Oct 8, 2018
f26b701
delete unused file
winoros Oct 8, 2018
260a951
fix the wrong test
winoros Oct 8, 2018
be51b0e
Merge branch 'master' into insubq-to-agg-and-join
winoros Oct 8, 2018
5ef7f65
Merge branch 'master' into insubq-to-agg-and-join
winoros Oct 22, 2018
091b5b7
fix panic in test.
winoros Oct 22, 2018
dd93228
address comment
winoros Oct 25, 2018
e08c2f6
Merge branch 'master' into insubq-to-agg-and-join
winoros Oct 25, 2018
d933826
fix explain_test
winoros Oct 25, 2018
8bc9c80
Merge branch 'master' into insubq-to-agg-and-join
winoros Oct 30, 2018
e788281
add it back
winoros Oct 30, 2018
fe1370c
fix explain test
winoros Oct 30, 2018
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22 changes: 14 additions & 8 deletions cmd/explaintest/r/explain_easy.result
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Expand Up @@ -5,7 +5,6 @@ create table t2 (c1 int unique, c2 int);
insert into t2 values(1, 0), (2, 1);
create table t3 (a bigint, b bigint, c bigint, d bigint);
create table t4 (a int, b int, c int, index idx(a, b), primary key(a));
set @@session.tidb_opt_insubquery_unfold = 1;
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It's better to keep this test and add another test which disables tidb_opt_insubquery_unfold.

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but this variable is removed

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Yeah, I just noticed that after reviewing all the code changes.

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Just changed the name. We still test both open it and close it.

set @@session.tidb_opt_agg_push_down = 1;
explain select * from t3 where exists (select s.a from t3 s having sum(s.a) = t3.a );
id count task operator info
Expand Down Expand Up @@ -87,14 +86,22 @@ TableReader_7 0.33 root data:Selection_6
└─TableScan_5 1.00 cop table:t1, range:[1,1], keep order:false, stats:pseudo
explain select sum(t1.c1 in (select c1 from t2)) from t1;
id count task operator info
StreamAgg_21 1.00 root funcs:sum(col_0)
└─TableReader_22 1.00 root data:StreamAgg_13
└─StreamAgg_13 1.00 cop funcs:sum(in(test.t1.c1, 1, 2))
└─TableScan_20 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
StreamAgg_12 1.00 root funcs:sum(5_aux_0)
└─MergeJoin_28 10000.00 root left outer semi join, left key:test.t1.c1, right key:test.t2.c1
├─TableReader_19 10000.00 root data:TableScan_18
│ └─TableScan_18 10000.00 cop table:t1, range:[-inf,+inf], keep order:true, stats:pseudo
└─IndexReader_23 10000.00 root index:IndexScan_22
└─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
TableReader_11 2.00 root data:TableScan_10
└─TableScan_10 2.00 cop table:t1, range:[0,0], [1,1], keep order:false, stats:pseudo
Projection_8 10000.00 root test.t1.c1
└─IndexJoin_11 10000.00 root inner join, inner:TableReader_10, outer key:test.t2.c2, inner key:test.t1.c1
├─TableReader_10 10.00 root data:TableScan_9
│ └─TableScan_9 10.00 cop table:t1, range: decided by [test.t2.c2], keep order:false, stats:pseudo
└─HashAgg_18 8000.00 root group by:col_1, funcs:firstrow(col_0)
└─TableReader_19 8000.00 root data:HashAgg_14
└─HashAgg_14 8000.00 cop group by:test.t2.c2, funcs:firstrow(test.t2.c2)
└─TableScan_17 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
explain select (select count(1) k from t1 s where s.c1 = t1.c1 having k != 0) from t1;
id count task operator info
Projection_13 10000.00 root k
Expand Down Expand Up @@ -181,7 +188,6 @@ HashAgg_15 24000.00 root group by:t2.c1, funcs:firstrow(join_agg_0)
└─IndexReader_64 8000.00 root index:StreamAgg_54
└─StreamAgg_54 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
└─IndexScan_62 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
set @@session.tidb_opt_insubquery_unfold = 0;
explain select sum(t1.c1 in (select c1 from t2)) from t1;
id count task operator info
StreamAgg_12 1.00 root funcs:sum(5_aux_0)
Expand Down
12 changes: 8 additions & 4 deletions cmd/explaintest/r/explain_easy_stats.result
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Expand Up @@ -8,7 +8,6 @@ create table t3 (a bigint, b bigint, c bigint, d bigint);
load stats 's/explain_easy_stats_t3.json';
create table index_prune(a bigint(20) NOT NULL, b bigint(20) NOT NULL, c tinyint(4) NOT NULL, primary key(a, b), index idx_b_c_a(b, c, a));
load stats 's/explain_easy_stats_index_prune.json';
set @@session.tidb_opt_insubquery_unfold = 1;
set @@session.tidb_opt_agg_push_down = 1;
explain select * from t3 where exists (select s.a from t3 s having sum(s.a) = t3.a );
id count task operator info
Expand Down Expand Up @@ -93,8 +92,14 @@ TableReader_7 0.50 root data:Selection_6
└─TableScan_5 1.00 cop table:t1, range:[1,1], keep order:false
explain select c1 from t1 where c1 in (select c2 from t2);
id count task operator info
Projection_10 0.00 root test.t1.c1
└─TableDual_11 0.00 root rows:0
Projection_8 1985.00 root test.t1.c1
└─IndexJoin_11 1985.00 root inner join, inner:TableReader_10, outer key:test.t2.c2, inner key:test.t1.c1
├─TableReader_10 1.00 root data:TableScan_9
│ └─TableScan_9 1.00 cop table:t1, range: decided by [test.t2.c2], keep order:false
└─HashAgg_18 1985.00 root group by:col_1, funcs:firstrow(col_0)
└─TableReader_19 1985.00 root data:HashAgg_14
└─HashAgg_14 1985.00 cop group by:test.t2.c2, funcs:firstrow(test.t2.c2)
└─TableScan_17 1985.00 cop table:t2, range:[-inf,+inf], keep order:false
explain select * from information_schema.columns;
id count task operator info
MemTableScan_4 10000.00 root
Expand All @@ -115,7 +120,6 @@ Limit_10 1.00 root offset:0, count:1
└─TableReader_21 1.00 root data:Limit_20
└─Limit_20 1.00 cop offset:0, count:1
└─TableScan_18 1.00 cop table:t1, range:[-inf,+inf], keep order:true, desc
set @@session.tidb_opt_insubquery_unfold = 0;
explain select 1 in (select c2 from t2) from t1;
id count task operator info
Projection_6 1999.00 root 5_aux_0
Expand Down
85 changes: 43 additions & 42 deletions cmd/explaintest/r/tpch.result
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Expand Up @@ -984,7 +984,7 @@ The Large Volume Customer Query ranks customers based on their having placed a l
quantity orders are defined as those orders whose total quantity is above a certain level.
The Large Volume Customer Query finds a list of the top 100 customers who have ever placed large quantity orders.
The query lists the customer name, customer key, the order key, date and total price and the quantity for the order.
Planner enhancement: unfold in subquery.
Planner enhancement: cost estimation is not so good, join reorder. The inner subquery's result is only 300+ rows.
*/
explain
select
Expand Down Expand Up @@ -1021,24 +1021,24 @@ o_totalprice desc,
o_orderdate
limit 100;
id count task operator info
Projection_20 100.00 root tpch.customer.c_name, tpch.customer.c_custkey, tpch.orders.o_orderkey, tpch.orders.o_orderdate, tpch.orders.o_totalprice, 13_col_0
└─TopN_23 100.00 root tpch.orders.o_totalprice:desc, tpch.orders.o_orderdate:asc, offset:0, count:100
└─HashAgg_26 60000000.00 root group by:tpch.customer.c_custkey, tpch.customer.c_name, tpch.orders.o_orderdate, tpch.orders.o_orderkey, tpch.orders.o_totalprice, funcs:sum(tpch.lineitem.l_quantity), firstrow(tpch.customer.c_custkey), firstrow(tpch.customer.c_name), firstrow(tpch.orders.o_orderkey), firstrow(tpch.orders.o_totalprice), firstrow(tpch.orders.o_orderdate)
└─HashLeftJoin_27 240004648.80 root semi join, inner:Selection_55, equal:[eq(tpch.orders.o_orderkey, tpch.lineitem.l_orderkey)]
├─IndexJoin_32 300005811.00 root inner join, inner:IndexLookUp_31, outer key:tpch.orders.o_orderkey, inner key:tpch.lineitem.l_orderkey
│ ├─HashRightJoin_48 75000000.00 root inner join, inner:TableReader_52, equal:[eq(tpch.customer.c_custkey, tpch.orders.o_custkey)]
│ │ ├─TableReader_52 7500000.00 root data:TableScan_51
│ │ │ └─TableScan_51 7500000.00 cop table:customer, range:[-inf,+inf], keep order:false
│ │ └─TableReader_50 75000000.00 root data:TableScan_49
│ │ └─TableScan_49 75000000.00 cop table:orders, range:[-inf,+inf], keep order:false
│ └─IndexLookUp_31 1.00 root
│ ├─IndexScan_29 1.00 cop table:lineitem, index:L_ORDERKEY, L_LINENUMBER, range: decided by [tpch.orders.o_orderkey], keep order:false
│ └─TableScan_30 1.00 cop table:lineitem, keep order:false
└─Selection_55 59251097.60 root gt(sel_agg_2, 314)
└─HashAgg_62 74063872.00 root group by:col_2, funcs:sum(col_0), firstrow(col_1)
└─TableReader_63 74063872.00 root data:HashAgg_56
└─HashAgg_56 74063872.00 cop group by:tpch.lineitem.l_orderkey, funcs:sum(tpch.lineitem.l_quantity), firstrow(tpch.lineitem.l_orderkey)
└─TableScan_61 300005811.00 cop table:lineitem, range:[-inf,+inf], keep order:false
Projection_22 100.00 root tpch.customer.c_name, tpch.customer.c_custkey, tpch.orders.o_orderkey, tpch.orders.o_orderdate, tpch.orders.o_totalprice, 14_col_0
└─TopN_25 100.00 root tpch.orders.o_totalprice:desc, tpch.orders.o_orderdate:asc, offset:0, count:100
└─HashAgg_28 75000000.00 root group by:tpch.customer.c_custkey, tpch.customer.c_name, tpch.orders.o_orderdate, tpch.orders.o_orderkey, tpch.orders.o_totalprice, funcs:sum(tpch.lineitem.l_quantity), firstrow(tpch.customer.c_custkey), firstrow(tpch.customer.c_name), firstrow(tpch.orders.o_orderkey), firstrow(tpch.orders.o_totalprice), firstrow(tpch.orders.o_orderdate)
└─HashLeftJoin_29 237008981.18 root inner join, inner:Selection_58, equal:[eq(tpch.orders.o_orderkey, tpch.lineitem.l_orderkey)]
├─IndexJoin_35 300005811.00 root inner join, inner:IndexLookUp_34, outer key:tpch.orders.o_orderkey, inner key:tpch.lineitem.l_orderkey
│ ├─HashRightJoin_51 75000000.00 root inner join, inner:TableReader_55, equal:[eq(tpch.customer.c_custkey, tpch.orders.o_custkey)]
│ │ ├─TableReader_55 7500000.00 root data:TableScan_54
│ │ │ └─TableScan_54 7500000.00 cop table:customer, range:[-inf,+inf], keep order:false
│ │ └─TableReader_53 75000000.00 root data:TableScan_52
│ │ └─TableScan_52 75000000.00 cop table:orders, range:[-inf,+inf], keep order:false
│ └─IndexLookUp_34 1.00 root
│ ├─IndexScan_32 1.00 cop table:lineitem, index:L_ORDERKEY, L_LINENUMBER, range: decided by [tpch.orders.o_orderkey], keep order:false
│ └─TableScan_33 1.00 cop table:lineitem, keep order:false
└─Selection_58 59251097.60 root gt(sel_agg_2, 314)
└─HashAgg_65 74063872.00 root group by:col_2, funcs:sum(col_0), firstrow(col_1)
└─TableReader_66 74063872.00 root data:HashAgg_59
└─HashAgg_59 74063872.00 cop group by:tpch.lineitem.l_orderkey, funcs:sum(tpch.lineitem.l_quantity), firstrow(tpch.lineitem.l_orderkey)
└─TableScan_64 300005811.00 cop table:lineitem, range:[-inf,+inf], keep order:false
/*
Q19 Discounted Revenue Query
The Discounted Revenue Query reports the gross discounted revenue attributed to the sale of selected parts handled
Expand Down Expand Up @@ -1140,29 +1140,30 @@ and n_name = 'ALGERIA'
order by
s_name;
id count task operator info
Sort_23 16000.00 root tpch.supplier.s_name:asc
└─Projection_25 16000.00 root tpch.supplier.s_name, tpch.supplier.s_address
└─HashLeftJoin_26 16000.00 root semi join, inner:Projection_38, equal:[eq(tpch.supplier.s_suppkey, tpch.partsupp.ps_suppkey)]
├─HashRightJoin_32 20000.00 root inner join, inner:TableReader_37, equal:[eq(tpch.nation.n_nationkey, tpch.supplier.s_nationkey)]
│ ├─TableReader_37 1.00 root data:Selection_36
│ │ └─Selection_36 1.00 cop eq(tpch.nation.n_name, "ALGERIA")
│ │ └─TableScan_35 25.00 cop table:nation, range:[-inf,+inf], keep order:false
│ └─TableReader_34 500000.00 root data:TableScan_33
│ └─TableScan_33 500000.00 cop table:supplier, range:[-inf,+inf], keep order:false
└─Projection_38 6363545.60 root tpch.partsupp.ps_partkey, tpch.partsupp.ps_suppkey, tpch.partsupp.ps_availqty, mul(0.5, 13_col_0)
└─Selection_39 6363545.60 root gt(cast(tpch.partsupp.ps_availqty), mul(0.5, 13_col_0))
└─HashAgg_42 7954432.00 root group by:tpch.partsupp.ps_partkey, tpch.partsupp.ps_suppkey, funcs:firstrow(tpch.partsupp.ps_partkey), firstrow(tpch.partsupp.ps_suppkey), firstrow(tpch.partsupp.ps_availqty), sum(tpch.lineitem.l_quantity)
└─HashLeftJoin_45 177770004.55 root left outer join, inner:TableReader_66, equal:[eq(tpch.partsupp.ps_partkey, tpch.lineitem.l_partkey) eq(tpch.partsupp.ps_suppkey, tpch.lineitem.l_suppkey)]
├─MergeJoin_46 32000000.00 root semi join, left key:tpch.partsupp.ps_partkey, right key:tpch.part.p_partkey
│ ├─IndexLookUp_55 40000000.00 root
│ │ ├─IndexScan_53 40000000.00 cop table:partsupp, index:PS_PARTKEY, PS_SUPPKEY, range:[NULL,+inf], keep order:true
│ │ └─TableScan_54 40000000.00 cop table:partsupp, keep order:false
│ └─TableReader_58 80007.93 root data:Selection_57
│ └─Selection_57 80007.93 cop like(tpch.part.p_name, "green%", 92)
│ └─TableScan_56 10000000.00 cop table:part, range:[-inf,+inf], keep order:true
└─TableReader_66 44189356.65 root data:Selection_65
└─Selection_65 44189356.65 cop ge(tpch.lineitem.l_shipdate, 1993-01-01 00:00:00.000000), lt(tpch.lineitem.l_shipdate, 1994-01-01)
└─TableScan_64 300005811.00 cop table:lineitem, range:[-inf,+inf], keep order:false
Sort_26 20000.00 root tpch.supplier.s_name:asc
└─Projection_28 20000.00 root tpch.supplier.s_name, tpch.supplier.s_address
└─HashRightJoin_30 20000.00 root inner join, inner:HashRightJoin_36, equal:[eq(tpch.supplier.s_suppkey, tpch.partsupp.ps_suppkey)]
├─HashRightJoin_36 20000.00 root inner join, inner:TableReader_41, equal:[eq(tpch.nation.n_nationkey, tpch.supplier.s_nationkey)]
│ ├─TableReader_41 1.00 root data:Selection_40
│ │ └─Selection_40 1.00 cop eq(tpch.nation.n_name, "ALGERIA")
│ │ └─TableScan_39 25.00 cop table:nation, range:[-inf,+inf], keep order:false
│ └─TableReader_38 500000.00 root data:TableScan_37
│ └─TableScan_37 500000.00 cop table:supplier, range:[-inf,+inf], keep order:false
└─HashAgg_44 257492.04 root group by:tpch.partsupp.ps_suppkey, funcs:firstrow(tpch.partsupp.ps_suppkey)
└─Projection_45 257492.04 root tpch.partsupp.ps_partkey, tpch.partsupp.ps_suppkey, tpch.partsupp.ps_availqty, tpch.part.p_partkey, mul(0.5, 14_col_0)
└─Selection_46 257492.04 root gt(cast(tpch.partsupp.ps_availqty), mul(0.5, 14_col_0))
└─HashAgg_49 321865.05 root group by:tpch.partsupp.ps_partkey, tpch.partsupp.ps_suppkey, funcs:firstrow(tpch.partsupp.ps_partkey), firstrow(tpch.partsupp.ps_suppkey), firstrow(tpch.partsupp.ps_availqty), firstrow(tpch.part.p_partkey), sum(tpch.lineitem.l_quantity)
└─HashLeftJoin_52 9711455.06 root left outer join, inner:TableReader_78, equal:[eq(tpch.partsupp.ps_partkey, tpch.lineitem.l_partkey) eq(tpch.partsupp.ps_suppkey, tpch.lineitem.l_suppkey)]
├─IndexJoin_61 321865.05 root inner join, inner:IndexLookUp_60, outer key:tpch.part.p_partkey, inner key:tpch.partsupp.ps_partkey
│ ├─IndexLookUp_60 1.00 root
│ │ ├─IndexScan_58 1.00 cop table:partsupp, index:PS_PARTKEY, PS_SUPPKEY, range: decided by [tpch.part.p_partkey], keep order:false
│ │ └─TableScan_59 1.00 cop table:partsupp, keep order:false
│ └─TableReader_73 80007.93 root data:Selection_72
│ └─Selection_72 80007.93 cop like(tpch.part.p_name, "green%", 92)
│ └─TableScan_71 10000000.00 cop table:part, range:[-inf,+inf], keep order:false
└─TableReader_78 44189356.65 root data:Selection_77
└─Selection_77 44189356.65 cop ge(tpch.lineitem.l_shipdate, 1993-01-01 00:00:00.000000), lt(tpch.lineitem.l_shipdate, 1994-01-01)
└─TableScan_76 300005811.00 cop table:lineitem, range:[-inf,+inf], keep order:false
/*
Q21 Suppliers Who Kept Orders Waiting Query
This query identifies certain suppliers who were not able to ship required parts in a timely manner.
Expand Down
3 changes: 0 additions & 3 deletions cmd/explaintest/t/explain_easy.test
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Expand Up @@ -6,7 +6,6 @@ insert into t2 values(1, 0), (2, 1);
create table t3 (a bigint, b bigint, c bigint, d bigint);
create table t4 (a int, b int, c int, index idx(a, b), primary key(a));

set @@session.tidb_opt_insubquery_unfold = 1;
set @@session.tidb_opt_agg_push_down = 1;

explain select * from t3 where exists (select s.a from t3 s having sum(s.a) = t3.a );
Expand Down Expand Up @@ -35,8 +34,6 @@ explain select if(10, t1.c1, t1.c2) from t1;
explain select c1 from t2 union select c1 from t2 union all select c1 from t2;
explain select c1 from t2 union all select c1 from t2 union select c1 from t2;

set @@session.tidb_opt_insubquery_unfold = 0;

explain select sum(t1.c1 in (select c1 from t2)) from t1;
explain select 1 in (select c2 from t2) from t1;
explain select sum(6 in (select c2 from t2)) from t1;
Expand Down
3 changes: 0 additions & 3 deletions cmd/explaintest/t/explain_easy_stats.test
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Expand Up @@ -8,7 +8,6 @@ create table t3 (a bigint, b bigint, c bigint, d bigint);
load stats 's/explain_easy_stats_t3.json';
create table index_prune(a bigint(20) NOT NULL, b bigint(20) NOT NULL, c tinyint(4) NOT NULL, primary key(a, b), index idx_b_c_a(b, c, a));
load stats 's/explain_easy_stats_index_prune.json';
set @@session.tidb_opt_insubquery_unfold = 1;
set @@session.tidb_opt_agg_push_down = 1;


Expand Down Expand Up @@ -38,8 +37,6 @@ explain select * from information_schema.columns;
explain select c2 = (select c2 from t2 where t1.c1 = t2.c1 order by c1 limit 1) from t1;
explain select * from t1 order by c1 desc limit 1;

set @@session.tidb_opt_insubquery_unfold = 0;

# explain select sum(t1.c1 in (select c1 from t2)) from t1;
explain select 1 in (select c2 from t2) from t1;
# explain select sum(6 in (select c2 from t2)) from t1;
Expand Down
2 changes: 1 addition & 1 deletion cmd/explaintest/t/tpch.test
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Expand Up @@ -773,7 +773,7 @@ where
The Large Volume Customer Query finds a list of the top 100 customers who have ever placed large quantity orders.
The query lists the customer name, customer key, the order key, date and total price and the quantity for the order.

Planner enhancement: unfold in subquery.
Planner enhancement: cost estimation is not so good, join reorder. The inner subquery's result is only 300+ rows.
*/
explain
select
Expand Down
4 changes: 2 additions & 2 deletions executor/aggregate_test.go
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Expand Up @@ -248,10 +248,10 @@ func (s *testSuite) TestAggregation(c *C) {
tk.MustExec("create table t2 (c1 int)")
tk.MustExec("insert into t1 values(3), (2)")
tk.MustExec("insert into t2 values(1), (2)")
tk.MustExec("set @@session.tidb_opt_insubquery_unfold = 1")
tk.MustExec("set @@session.tidb_opt_insubquery_rewriting = 0")
result = tk.MustQuery("select sum(c1 in (select * from t2)) from t1")
result.Check(testkit.Rows("1"))
tk.MustExec("set @@session.tidb_opt_insubquery_unfold = 0")
tk.MustExec("set @@session.tidb_opt_insubquery_rewriting = 1")
result = tk.MustQuery("select sum(c1 in (select * from t2)) from t1")
result.Check(testkit.Rows("1"))
result = tk.MustQuery("select sum(c1) k from (select * from t1 union all select * from t2)t group by c1 * 2 order by k")
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4 changes: 2 additions & 2 deletions executor/join_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -726,14 +726,14 @@ func (s *testSuite) TestInSubquery(c *C) {
tk.MustExec("create table t2 (a int)")
tk.MustExec("insert into t1 values (1),(2)")
tk.MustExec("insert into t2 values (1),(2)")
tk.MustExec("set @@session.tidb_opt_insubquery_unfold = 1")
tk.MustExec("set @@session.tidb_opt_insubquery_rewriting = 0")
result = tk.MustQuery("select * from t1 where a in (select * from t2)")
result.Sort().Check(testkit.Rows("1", "2"))
result = tk.MustQuery("select * from t1 where a in (select * from t2 where false)")
result.Check(testkit.Rows())
result = tk.MustQuery("select * from t1 where a not in (select * from t2 where false)")
result.Sort().Check(testkit.Rows("1", "2"))
tk.MustExec("set @@session.tidb_opt_insubquery_unfold = 0")
tk.MustExec("set @@session.tidb_opt_insubquery_rewriting = 1")
result = tk.MustQuery("select * from t1 where a in (select * from t2)")
result.Sort().Check(testkit.Rows("1", "2"))
result = tk.MustQuery("select * from t1 where a in (select * from t2 where false)")
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2 changes: 1 addition & 1 deletion plan/cbo_test.go
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Expand Up @@ -355,7 +355,7 @@ func (s *testAnalyzeSuite) TestEmptyTable(c *C) {
},
{
sql: "select * from t where c1 in (select c1 from t1)",
best: "LeftHashJoin{TableReader(Table(t))->TableReader(Table(t1))}(test.t.c1,test.t1.c1)",
best: "LeftHashJoin{TableReader(Table(t))->TableReader(Table(t1)->HashAgg)->HashAgg}(test.t.c1,test.t1.c1)->Projection",
},
{
sql: "select * from t, t1 where t.c1 = t1.c1",
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