45 lines
2.9 KiB
Plaintext
45 lines
2.9 KiB
Plaintext
drop table if exists t1;
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drop table if exists t2;
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create table t1(a bigint, b bigint);
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create table t2(a bigint, b bigint);
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set session tidb_hashagg_partial_concurrency = 1;
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set session tidb_hashagg_final_concurrency = 1;
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explain select * from t1 where t1.a in (select t1.b + t2.b from t2);
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id count task operator info
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HashLeftJoin_8 8000.00 root CARTESIAN semi join, inner:TableReader_12, other cond:eq(Column#1, plus(Column#2, Column#5))
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├─TableReader_10 10000.00 root data:TableScan_9
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│ └─TableScan_9 10000.00 cop[tikv] table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─TableReader_12 10000.00 root data:TableScan_11
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└─TableScan_11 10000.00 cop[tikv] table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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drop table if exists t;
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create table t(a int primary key, b int, c int, d int, index idx(b,c,d));
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insert into t values(1,1,1,1),(2,2,2,2),(3,2,2,2),(4,2,2,2),(5,2,2,2);
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analyze table t;
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explain select t.c in (select count(*) from t s use index(idx), t t1 where s.b = 1 and s.c = 1 and s.d = t.a and s.a = t1.a) from t;
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id count task operator info
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Projection_11 5.00 root Column#15
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└─Apply_13 5.00 root CARTESIAN left outer semi join, inner:StreamAgg_22, other cond:eq(Column#3, Column#13)
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├─TableReader_15 5.00 root data:TableScan_14
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│ └─TableScan_14 5.00 cop[tikv] table:t, range:[-inf,+inf], keep order:false
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└─StreamAgg_22 1.00 root funcs:count(1)
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└─IndexMergeJoin_29 0.50 root inner join, inner:TableReader_27, outer key:Column#5, inner key:Column#9
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├─IndexReader_35 1.00 root index:IndexScan_34
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│ └─IndexScan_34 1.00 cop[tikv] table:s, index:b, c, d, range: decided by [eq(Column#6, 1) eq(Column#7, 1) eq(Column#8, Column#1)], keep order:false
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└─TableReader_27 1.00 root data:TableScan_26
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└─TableScan_26 1.00 cop[tikv] table:t1, range: decided by [Column#5], keep order:true
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drop table if exists t;
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create table t(a int, b int, c int);
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explain select a from t t1 where t1.a = (select max(t2.a) from t t2 where t1.b=t2.b and t1.c=t2.b);
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id count task operator info
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Projection_11 7992.00 root Column#1
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└─HashLeftJoin_12 7992.00 root inner join, inner:Selection_17, equal:[eq(Column#2, Column#6) eq(Column#3, Column#6) eq(Column#1, Column#9)]
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├─TableReader_16 9970.03 root data:Selection_15
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│ └─Selection_15 9970.03 cop[tikv] not(isnull(Column#1)), not(isnull(Column#2)), not(isnull(Column#3))
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│ └─TableScan_14 10000.00 cop[tikv] table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─Selection_17 6393.60 root not(isnull(Column#9))
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└─HashAgg_23 7992.00 root group by:Column#14, funcs:max(Column#12), firstrow(Column#14)
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└─TableReader_24 7992.00 root data:HashAgg_18
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└─HashAgg_18 7992.00 cop[tikv] group by:Column#6, funcs:max(Column#5)
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└─Selection_22 9990.00 cop[tikv] not(isnull(Column#6))
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└─TableScan_21 10000.00 cop[tikv] table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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