594 lines
33 KiB
Plaintext
594 lines
33 KiB
Plaintext
use test;
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drop table if exists t1, t2, t3, t4;
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create table t1 (c1 int primary key, c2 int, c3 int, index c2 (c2));
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create table t2 (c1 int unique, c2 int);
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insert into t2 values(1, 0), (2, 1);
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create table t3 (a bigint, b bigint, c bigint, d bigint);
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create table t4 (a int, b int, c int, index idx(a, b), primary key(a));
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set @@session.tidb_opt_agg_push_down = 1;
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set @@session.tidb_opt_insubq_to_join_and_agg=1;
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explain select * from t3 where exists (select s.a from t3 s having sum(s.a) = t3.a );
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id count task operator info
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Projection_12 8000.00 root test.t3.a, test.t3.b, test.t3.c, test.t3.d
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└─HashLeftJoin_13 8000.00 root semi join, inner:StreamAgg_29, equal:[eq(cast(test.t3.a), sel_agg_1)]
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├─Projection_14 10000.00 root test.t3.a, test.t3.b, test.t3.c, test.t3.d, cast(test.t3.a)
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│ └─TableReader_16 10000.00 root data:TableScan_15
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│ └─TableScan_15 10000.00 cop table:t3, range:[-inf,+inf], keep order:false, stats:pseudo
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└─StreamAgg_29 1.00 root funcs:sum(col_0)
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└─TableReader_30 1.00 root data:StreamAgg_21
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└─StreamAgg_21 1.00 cop funcs:sum(s.a)
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└─TableScan_28 10000.00 cop table:s, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select * from t1;
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id count task operator info
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TableReader_5 10000.00 root data:TableScan_4
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└─TableScan_4 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select * from t1 order by c2;
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id count task operator info
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IndexLookUp_13 10000.00 root
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├─IndexScan_11 10000.00 cop table:t1, index:c2, range:[NULL,+inf], keep order:true, stats:pseudo
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└─TableScan_12 10000.00 cop table:t1, keep order:false, stats:pseudo
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explain select * from t2 order by c2;
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id count task operator info
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Sort_4 10000.00 root test.t2.c2:asc
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└─TableReader_8 10000.00 root data:TableScan_7
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└─TableScan_7 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select * from t1 where t1.c1 > 0;
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id count task operator info
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TableReader_6 3333.33 root data:TableScan_5
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└─TableScan_5 3333.33 cop table:t1, range:(0,+inf], keep order:false, stats:pseudo
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explain select t1.c1, t1.c2 from t1 where t1.c2 = 1;
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id count task operator info
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IndexReader_6 10.00 root index:IndexScan_5
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└─IndexScan_5 10.00 cop table:t1, index:c2, range:[1,1], keep order:false, stats:pseudo
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explain select * from t1 left join t2 on t1.c2 = t2.c1 where t1.c1 > 1;
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id count task operator info
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IndexJoin_12 4166.67 root left outer join, inner:IndexLookUp_11, outer key:test.t1.c2, inner key:test.t2.c1
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├─TableReader_26 3333.33 root data:TableScan_25
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│ └─TableScan_25 3333.33 cop table:t1, range:(1,+inf], keep order:false, stats:pseudo
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└─IndexLookUp_11 0.00 root
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├─Selection_10 0.00 cop not(isnull(test.t2.c1))
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│ └─IndexScan_8 10.00 cop table:t2, index:c1, range: decided by [test.t1.c2], keep order:false, stats:pseudo
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└─TableScan_9 0.00 cop table:t2, keep order:false
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explain update t1 set t1.c2 = 2 where t1.c1 = 1;
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id count task operator info
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Point_Get_1 1.00 root table:t1, handle:1
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explain delete from t1 where t1.c2 = 1;
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id count task operator info
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IndexLookUp_9 10.00 root
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├─IndexScan_7 10.00 cop table:t1, index:c2, range:[1,1], keep order:false, stats:pseudo
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└─TableScan_8 10.00 cop table:t1, keep order:false, stats:pseudo
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explain select count(b.c2) from t1 a, t2 b where a.c1 = b.c2 group by a.c1;
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id count task operator info
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Projection_11 9990.00 root cast(join_agg_0)
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└─IndexJoin_14 9990.00 root inner join, inner:TableReader_13, outer key:b.c2, inner key:a.c1
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├─TableReader_13 10.00 root data:TableScan_12
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│ └─TableScan_12 10.00 cop table:a, range: decided by [b.c2], keep order:false, stats:pseudo
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└─HashAgg_22 7992.00 root group by:col_2, funcs:count(col_0), firstrow(col_1)
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└─TableReader_23 7992.00 root data:HashAgg_17
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└─HashAgg_17 7992.00 cop group by:b.c2, funcs:count(b.c2), firstrow(b.c2)
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└─Selection_21 9990.00 cop not(isnull(b.c2))
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└─TableScan_20 10000.00 cop table:b, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select * from t2 order by t2.c2 limit 0, 1;
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id count task operator info
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TopN_7 1.00 root test.t2.c2:asc, offset:0, count:1
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└─TableReader_15 1.00 root data:TopN_14
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└─TopN_14 1.00 cop test.t2.c2:asc, offset:0, count:1
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└─TableScan_13 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select * from t1 where c1 > 1 and c2 = 1 and c3 < 1;
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id count task operator info
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IndexLookUp_12 1.11 root
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├─Selection_10 3.33 cop gt(test.t1.c1, 1)
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│ └─IndexScan_8 10.00 cop table:t1, index:c2, range:[1,1], keep order:false, stats:pseudo
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└─Selection_11 1.11 cop lt(test.t1.c3, 1)
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└─TableScan_9 3.33 cop table:t1, keep order:false
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explain select * from t1 where c1 = 1 and c2 > 1;
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id count task operator info
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TableReader_7 0.33 root data:Selection_6
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└─Selection_6 0.33 cop gt(test.t1.c2, 1)
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└─TableScan_5 1.00 cop table:t1, range:[1,1], keep order:false, stats:pseudo
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explain select sum(t1.c1 in (select c1 from t2)) from t1;
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id count task operator info
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StreamAgg_12 1.00 root funcs:sum(col_0)
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└─Projection_19 10000.00 root cast(5_aux_0)
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└─HashLeftJoin_18 10000.00 root left outer semi join, inner:TableReader_17, other cond:eq(test.t1.c1, test.t2.c1)
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├─TableReader_15 10000.00 root data:TableScan_14
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│ └─TableScan_14 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─TableReader_17 10000.00 root data:TableScan_16
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└─TableScan_16 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select c1 from t1 where c1 in (select c2 from t2);
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id count task operator info
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Projection_9 9990.00 root test.t1.c1
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└─IndexJoin_12 9990.00 root inner join, inner:TableReader_11, outer key:test.t2.c2, inner key:test.t1.c1
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├─TableReader_11 10.00 root data:TableScan_10
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│ └─TableScan_10 10.00 cop table:t1, range: decided by [test.t2.c2], keep order:false, stats:pseudo
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└─HashAgg_20 7992.00 root group by:col_1, funcs:firstrow(col_0)
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└─TableReader_21 7992.00 root data:HashAgg_15
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└─HashAgg_15 7992.00 cop group by:test.t2.c2, funcs:firstrow(test.t2.c2)
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└─Selection_19 9990.00 cop not(isnull(test.t2.c2))
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└─TableScan_18 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select (select count(1) k from t1 s where s.c1 = t1.c1 having k != 0) from t1;
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id count task operator info
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Projection_12 10000.00 root k
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└─Projection_13 10000.00 root test.t1.c1, ifnull(5_col_0, 0)
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└─MergeJoin_14 10000.00 root left outer join, left key:test.t1.c1, right key:s.c1
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├─TableReader_17 10000.00 root data:TableScan_16
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│ └─TableScan_16 10000.00 cop table:t1, range:[-inf,+inf], keep order:true, stats:pseudo
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└─Projection_18 8000.00 root 1, s.c1
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└─TableReader_20 10000.00 root data:TableScan_19
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└─TableScan_19 10000.00 cop table:s, range:[-inf,+inf], keep order:true, stats:pseudo
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explain select * from information_schema.columns;
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id count task operator info
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MemTableScan_4 10000.00 root
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explain select c2 = (select c2 from t2 where t1.c1 = t2.c1 order by c1 limit 1) from t1;
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id count task operator info
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Projection_12 10000.00 root eq(test.t1.c2, test.t2.c2)
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└─Apply_14 10000.00 root left outer join, inner:Limit_21
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├─TableReader_16 10000.00 root data:TableScan_15
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│ └─TableScan_15 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─Limit_21 1.00 root offset:0, count:1
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└─Projection_44 1.00 root test.t2.c1, test.t2.c2
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└─IndexLookUp_43 1.00 root
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├─Limit_42 1.00 cop offset:0, count:1
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│ └─IndexScan_40 1.00 cop table:t2, index:c1, range: decided by [eq(test.t1.c1, test.t2.c1)], keep order:true, stats:pseudo
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└─TableScan_41 1.00 cop table:t2, keep order:false
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explain select * from t1 order by c1 desc limit 1;
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id count task operator info
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Limit_10 1.00 root offset:0, count:1
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└─TableReader_20 1.00 root data:Limit_19
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└─Limit_19 1.00 cop offset:0, count:1
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└─TableScan_18 1.00 cop table:t1, range:[-inf,+inf], keep order:true, desc, stats:pseudo
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explain select * from t4 use index(idx) where a > 1 and b > 1 and c > 1 limit 1;
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id count task operator info
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Limit_9 1.00 root offset:0, count:1
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└─IndexLookUp_17 1.00 root
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├─Selection_14 3.00 cop gt(test.t4.b, 1)
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│ └─IndexScan_12 9.00 cop table:t4, index:a, b, range:(1,+inf], keep order:false, stats:pseudo
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└─Limit_16 1.00 cop offset:0, count:1
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└─Selection_15 1.00 cop gt(test.t4.c, 1)
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└─TableScan_13 3.00 cop table:t4, keep order:false
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explain select * from t4 where a > 1 and c > 1 limit 1;
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id count task operator info
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Limit_8 1.00 root offset:0, count:1
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└─TableReader_14 1.00 root data:Limit_13
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└─Limit_13 1.00 cop offset:0, count:1
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└─Selection_12 1.00 cop gt(test.t4.c, 1)
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└─TableScan_11 3.00 cop table:t4, range:(1,+inf], keep order:false, stats:pseudo
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explain select ifnull(null, t1.c1) from t1;
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id count task operator info
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TableReader_5 10000.00 root data:TableScan_4
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└─TableScan_4 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select if(10, t1.c1, t1.c2) from t1;
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id count task operator info
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TableReader_5 10000.00 root data:TableScan_4
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└─TableScan_4 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select c1 from t2 union select c1 from t2 union all select c1 from t2;
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id count task operator info
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Union_17 26000.00 root
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├─HashAgg_21 16000.00 root group by:c1, funcs:firstrow(join_agg_0)
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│ └─Union_22 16000.00 root
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│ ├─StreamAgg_34 8000.00 root group by:col_2, funcs:firstrow(col_0), firstrow(col_1)
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│ │ └─IndexReader_35 8000.00 root index:StreamAgg_26
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│ │ └─StreamAgg_26 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
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│ │ └─IndexScan_33 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
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│ └─StreamAgg_49 8000.00 root group by:col_2, funcs:firstrow(col_0), firstrow(col_1)
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│ └─IndexReader_50 8000.00 root index:StreamAgg_41
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│ └─StreamAgg_41 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
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│ └─IndexScan_48 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
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└─TableReader_55 10000.00 root data:TableScan_54
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└─TableScan_54 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select c1 from t2 union all select c1 from t2 union select c1 from t2;
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id count task operator info
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HashAgg_18 24000.00 root group by:c1, funcs:firstrow(join_agg_0)
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└─Union_19 24000.00 root
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├─StreamAgg_31 8000.00 root group by:col_2, funcs:firstrow(col_0), firstrow(col_1)
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│ └─IndexReader_32 8000.00 root index:StreamAgg_23
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│ └─StreamAgg_23 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
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│ └─IndexScan_30 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
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├─StreamAgg_46 8000.00 root group by:col_2, funcs:firstrow(col_0), firstrow(col_1)
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│ └─IndexReader_47 8000.00 root index:StreamAgg_38
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│ └─StreamAgg_38 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
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│ └─IndexScan_45 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
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└─StreamAgg_61 8000.00 root group by:col_2, funcs:firstrow(col_0), firstrow(col_1)
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└─IndexReader_62 8000.00 root index:StreamAgg_53
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└─StreamAgg_53 8000.00 cop group by:test.t2.c1, funcs:firstrow(test.t2.c1), firstrow(test.t2.c1)
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└─IndexScan_60 10000.00 cop table:t2, index:c1, range:[NULL,+inf], keep order:true, stats:pseudo
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set @@session.tidb_opt_insubq_to_join_and_agg=0;
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explain select sum(t1.c1 in (select c1 from t2)) from t1;
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id count task operator info
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StreamAgg_12 1.00 root funcs:sum(col_0)
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└─Projection_19 10000.00 root cast(5_aux_0)
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└─HashLeftJoin_18 10000.00 root left outer semi join, inner:TableReader_17, other cond:eq(test.t1.c1, test.t2.c1)
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├─TableReader_15 10000.00 root data:TableScan_14
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│ └─TableScan_14 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─TableReader_17 10000.00 root data:TableScan_16
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└─TableScan_16 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select 1 in (select c2 from t2) from t1;
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id count task operator info
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Projection_6 10000.00 root 5_aux_0
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└─HashLeftJoin_7 10000.00 root left outer semi join, inner:TableReader_12
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├─TableReader_9 10000.00 root data:TableScan_8
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│ └─TableScan_8 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─TableReader_12 10.00 root data:Selection_11
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└─Selection_11 10.00 cop eq(1, test.t2.c2)
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└─TableScan_10 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain select sum(6 in (select c2 from t2)) from t1;
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id count task operator info
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StreamAgg_12 1.00 root funcs:sum(col_0)
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└─Projection_20 10000.00 root cast(5_aux_0)
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└─HashLeftJoin_19 10000.00 root left outer semi join, inner:TableReader_18
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├─TableReader_15 10000.00 root data:TableScan_14
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│ └─TableScan_14 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
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└─TableReader_18 10.00 root data:Selection_17
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└─Selection_17 10.00 cop eq(6, test.t2.c2)
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└─TableScan_16 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
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explain format="dot" select sum(t1.c1 in (select c1 from t2)) from t1;
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dot contents
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digraph StreamAgg_12 {
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subgraph cluster12{
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node [style=filled, color=lightgrey]
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color=black
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label = "root"
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"StreamAgg_12" -> "Projection_19"
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"Projection_19" -> "HashLeftJoin_18"
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"HashLeftJoin_18" -> "TableReader_15"
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"HashLeftJoin_18" -> "TableReader_17"
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}
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subgraph cluster14{
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node [style=filled, color=lightgrey]
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color=black
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label = "cop"
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"TableScan_14"
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}
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subgraph cluster16{
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node [style=filled, color=lightgrey]
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color=black
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label = "cop"
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"TableScan_16"
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}
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"TableReader_15" -> "TableScan_14"
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"TableReader_17" -> "TableScan_16"
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}
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explain format="dot" select 1 in (select c2 from t2) from t1;
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dot contents
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digraph Projection_6 {
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subgraph cluster6{
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node [style=filled, color=lightgrey]
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color=black
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label = "root"
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"Projection_6" -> "HashLeftJoin_7"
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"HashLeftJoin_7" -> "TableReader_9"
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"HashLeftJoin_7" -> "TableReader_12"
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}
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subgraph cluster8{
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node [style=filled, color=lightgrey]
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color=black
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label = "cop"
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"TableScan_8"
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}
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subgraph cluster11{
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node [style=filled, color=lightgrey]
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color=black
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label = "cop"
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"Selection_11" -> "TableScan_10"
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}
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"TableReader_9" -> "TableScan_8"
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"TableReader_12" -> "Selection_11"
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}
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drop table if exists t1, t2, t3, t4;
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drop table if exists t;
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create table t(a int primary key, b int, c int, index idx(b));
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explain select t.c in (select count(*) from t s ignore index(idx), t t1 where s.a = t.a and s.a = t1.a) from t;
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id count task operator info
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Projection_11 10000.00 root 9_aux_0
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└─Apply_13 10000.00 root left outer semi join, inner:StreamAgg_20, other cond:eq(test.t.c, 7_col_0)
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├─TableReader_15 10000.00 root data:TableScan_14
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│ └─TableScan_14 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
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└─StreamAgg_20 1.00 root funcs:count(1)
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└─IndexJoin_44 12.50 root inner join, inner:TableReader_43, outer key:s.a, inner key:t1.a
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├─TableReader_37 1.00 root data:TableScan_36
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│ └─TableScan_36 1.00 cop table:s, range: decided by [eq(s.a, test.t.a)], keep order:false, stats:pseudo
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└─TableReader_43 10.00 root data:Selection_42
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└─Selection_42 10.00 cop eq(t1.a, test.t.a)
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└─TableScan_41 10.00 cop table:t1, range: decided by [s.a], keep order:false, stats:pseudo
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explain select t.c in (select count(*) from t s use index(idx), t t1 where s.b = t.a and s.a = t1.a) from t;
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id count task operator info
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Projection_11 10000.00 root 9_aux_0
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└─Apply_13 10000.00 root left outer semi join, inner:StreamAgg_20, other cond:eq(test.t.c, 7_col_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_32 12.50 root inner join, inner:TableReader_31, outer key:s.a, inner key:t1.a
|
|
├─IndexReader_27 10.00 root index:IndexScan_26
|
|
│ └─IndexScan_26 10.00 cop table:s, index:b, range: decided by [eq(s.b, test.t.a)], keep order:false, stats:pseudo
|
|
└─TableReader_31 10.00 root data:TableScan_30
|
|
└─TableScan_30 10.00 cop table:t1, range: decided by [s.a], keep order:false, stats:pseudo
|
|
explain select t.c in (select count(*) from t s use index(idx), t t1 where s.b = t.a and s.c = t1.a) from t;
|
|
id count task operator info
|
|
Projection_11 10000.00 root 9_aux_0
|
|
└─Apply_13 10000.00 root left outer semi join, inner:StreamAgg_20, other cond:eq(test.t.c, 7_col_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_34 12.49 root inner join, inner:TableReader_33, outer key:s.c, inner key:t1.a
|
|
├─IndexLookUp_29 9.99 root
|
|
│ ├─IndexScan_26 10.00 cop table:s, index:b, range: decided by [eq(s.b, test.t.a)], keep order:false, stats:pseudo
|
|
│ └─Selection_28 9.99 cop not(isnull(s.c))
|
|
│ └─TableScan_27 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;
|
|
id count task operator info
|
|
Projection_3 10000.00 root eq(test.t.a, 123455)
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select t.a > '123455' from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root gt(test.t.a, 123455)
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select t.a != '123455' from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root ne(test.t.a, 123455)
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select t.a = 12345678912345678998789678687678.111 from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root 0
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a bigint, b bigint, index idx(a, b));
|
|
explain select * from t where a in (1, 2) and a in (1, 3);
|
|
id count task operator info
|
|
IndexReader_6 10.00 root index:IndexScan_5
|
|
└─IndexScan_5 10.00 cop table:t, index:a, b, range:[1,1], keep order:false, stats:pseudo
|
|
explain select * from t where b in (1, 2) and b in (1, 3);
|
|
id count task operator info
|
|
TableReader_7 10.00 root data:Selection_6
|
|
└─Selection_6 10.00 cop in(test.t.b, 1, 2), in(test.t.b, 1, 3)
|
|
└─TableScan_5 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from t where a = 1 and a = 1;
|
|
id count task operator info
|
|
IndexReader_6 10.00 root index:IndexScan_5
|
|
└─IndexScan_5 10.00 cop table:t, index:a, b, range:[1,1], keep order:false, stats:pseudo
|
|
explain select * from t where a = 1 and a = 2;
|
|
id count task operator info
|
|
TableDual_5 0.00 root rows:0
|
|
explain select * from t where b = 1 and b = 2;
|
|
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 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_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)]
|
|
├─TableReader_11 10000.00 root data:TableScan_10
|
|
│ └─TableScan_10 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_13 10000.00 root data:TableScan_12
|
|
└─TableScan_12 10000.00 cop table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a bigint primary key);
|
|
explain select * from t where a = 1 and a = 2;
|
|
id count task operator info
|
|
TableDual_5 0.00 root rows:0
|
|
explain select null or a > 1 from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root or(NULL, gt(test.t.a, 1))
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
drop table if exists ta, tb;
|
|
create table ta (a varchar(20));
|
|
create table tb (a varchar(20));
|
|
begin;
|
|
insert tb values ('1');
|
|
explain select * from ta where a = 1;
|
|
id count task operator info
|
|
Projection_5 8000.00 root test.ta.a
|
|
└─Selection_6 8000.00 root eq(cast(test.ta.a), 1)
|
|
└─UnionScan_7 10000.00 root eq(cast(test.ta.a), 1)
|
|
└─TableReader_9 10000.00 root data:TableScan_8
|
|
└─TableScan_8 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
rollback;
|
|
drop table if exists t1, t2;
|
|
create table t1(a int, b int, c int, primary key(a, b));
|
|
create table t2(a int, b int, c int, primary key(a));
|
|
explain select t1.a, t1.b from t1 left outer join t2 on t1.a = t2.a;
|
|
id count task operator info
|
|
TableReader_7 10000.00 root data:TableScan_6
|
|
└─TableScan_6 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select distinct t1.a, t1.b from t1 left outer join t2 on t1.a = t2.a;
|
|
id count task operator info
|
|
StreamAgg_18 8000.00 root group by:col_2, col_3, funcs:firstrow(col_0), firstrow(col_1)
|
|
└─IndexReader_19 8000.00 root index:StreamAgg_10
|
|
└─StreamAgg_10 8000.00 cop group by:test.t1.a, test.t1.b, funcs:firstrow(test.t1.a), firstrow(test.t1.b)
|
|
└─IndexScan_17 10000.00 cop table:t1, index:a, b, range:[NULL,+inf], keep order:true, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, nb int not null, nc int not null);
|
|
explain select ifnull(a, 0) from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root ifnull(test.t.a, 0)
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(nb, 0) from t;
|
|
id count task operator info
|
|
TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(nb, 0), ifnull(nc, 0) from t;
|
|
id count task operator info
|
|
TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(a, 0), ifnull(nb, 0) from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root ifnull(test.t.a, 0), test.t.nb
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(nb, 0), ifnull(nb, 0) from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root test.t.nb, test.t.nb
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select 1+ifnull(nb, 0) from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root plus(1, test.t.nb)
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select 1+ifnull(a, 0) from t;
|
|
id count task operator info
|
|
Projection_3 10000.00 root plus(1, ifnull(test.t.a, 0))
|
|
└─TableReader_5 10000.00 root data:TableScan_4
|
|
└─TableScan_4 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select 1+ifnull(nb, 0) from t where nb=1;
|
|
id count task operator info
|
|
Projection_4 10.00 root plus(1, test.t.nb)
|
|
└─TableReader_7 10.00 root data:Selection_6
|
|
└─Selection_6 10.00 cop eq(test.t.nb, 1)
|
|
└─TableScan_5 10000.00 cop table:t, 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(ta.nb, 1) or ta.nb is null;
|
|
id count task operator info
|
|
HashLeftJoin_7 8320.83 root left outer join, inner:TableReader_12, equal:[eq(ta.nb, tb.nb)], left cond:[gt(ta.a, 1)]
|
|
├─TableReader_10 6656.67 root data:Selection_9
|
|
│ └─Selection_9 6656.67 cop or(ta.nb, isnull(ta.nb))
|
|
│ └─TableScan_8 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_12 10000.00 root data:TableScan_11
|
|
└─TableScan_11 10000.00 cop table:tb, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from t ta right outer join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(tb.nb, 1) or tb.nb is null;
|
|
id count task operator info
|
|
HashRightJoin_7 6656.67 root right outer join, inner:TableReader_10, equal:[eq(ta.nb, tb.nb)]
|
|
├─TableReader_10 3333.33 root data:Selection_9
|
|
│ └─Selection_9 3333.33 cop gt(ta.a, 1)
|
|
│ └─TableScan_8 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_13 6656.67 root data:Selection_12
|
|
└─Selection_12 6656.67 cop or(tb.nb, isnull(tb.nb))
|
|
└─TableScan_11 10000.00 cop table:tb, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from t ta inner join t tb on ta.nb = tb.nb and ta.a > 1 where ifnull(tb.nb, 1) or tb.nb is null;
|
|
id count task operator info
|
|
HashRightJoin_9 4166.67 root inner join, inner:TableReader_12, equal:[eq(ta.nb, tb.nb)]
|
|
├─TableReader_12 3333.33 root data:Selection_11
|
|
│ └─Selection_11 3333.33 cop gt(ta.a, 1)
|
|
│ └─TableScan_10 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_15 6656.67 root data:Selection_14
|
|
└─Selection_14 6656.67 cop or(tb.nb, isnull(tb.nb))
|
|
└─TableScan_13 10000.00 cop table:tb, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(t.nc, 1) in (select count(*) from t s , t t1 where s.a = t.a and s.a = t1.a) from t;
|
|
id count task operator info
|
|
Projection_12 10000.00 root 9_aux_0
|
|
└─Apply_14 10000.00 root left outer semi join, inner:HashAgg_19, other cond:eq(test.t.nc, 7_col_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)
|
|
└─HashLeftJoin_20 9.99 root inner join, inner:HashAgg_30, equal:[eq(s.a, t1.a)]
|
|
├─TableReader_24 9.99 root data:Selection_23
|
|
│ └─Selection_23 9.99 cop eq(s.a, test.t.a), not(isnull(s.a))
|
|
│ └─TableScan_22 10000.00 cop table:s, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─HashAgg_30 7.99 root group by:col_2, funcs:count(col_0), firstrow(col_1)
|
|
└─TableReader_31 7.99 root data:HashAgg_25
|
|
└─HashAgg_25 7.99 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
|
|
└─Selection_29 9.99 cop eq(t1.a, test.t.a), not(isnull(t1.a))
|
|
└─TableScan_28 10000.00 cop table:t1, 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
|
|
Selection_7 10000.00 root or(ifnull(tb.a, 1), isnull(tb.a))
|
|
└─HashLeftJoin_8 12500.00 root left outer join, inner:TableReader_12, equal:[eq(ta.nb, tb.nb)], left cond:[gt(ta.a, 1)]
|
|
├─TableReader_10 10000.00 root data:TableScan_9
|
|
│ └─TableScan_9 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_12 10000.00 root data:TableScan_11
|
|
└─TableScan_11 10000.00 cop table:tb, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from t ta right 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
|
|
HashRightJoin_7 8000.00 root right outer join, inner:TableReader_10, equal:[eq(ta.nb, tb.nb)]
|
|
├─TableReader_10 3333.33 root data:Selection_9
|
|
│ └─Selection_9 3333.33 cop gt(ta.a, 1)
|
|
│ └─TableScan_8 10000.00 cop table:ta, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─TableReader_13 8000.00 root data:Selection_12
|
|
└─Selection_12 8000.00 cop or(ifnull(tb.a, 1), isnull(tb.a))
|
|
└─TableScan_11 10000.00 cop table:tb, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select ifnull(t.a, 1) in (select count(*) from t s , t t1 where s.a = t.a and s.a = t1.a) from t;
|
|
id count task operator info
|
|
Projection_12 10000.00 root 9_aux_0
|
|
└─Apply_14 10000.00 root left outer semi join, inner:HashAgg_19, other cond:eq(ifnull(test.t.a, 1), 7_col_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)
|
|
└─HashLeftJoin_20 9.99 root inner join, inner:HashAgg_30, equal:[eq(s.a, t1.a)]
|
|
├─TableReader_24 9.99 root data:Selection_23
|
|
│ └─Selection_23 9.99 cop eq(s.a, test.t.a), not(isnull(s.a))
|
|
│ └─TableScan_22 10000.00 cop table:s, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
└─HashAgg_30 7.99 root group by:col_2, funcs:count(col_0), firstrow(col_1)
|
|
└─TableReader_31 7.99 root data:HashAgg_25
|
|
└─HashAgg_25 7.99 cop group by:t1.a, funcs:count(1), firstrow(t1.a)
|
|
└─Selection_29 9.99 cop eq(t1.a, test.t.a), not(isnull(t1.a))
|
|
└─TableScan_28 10000.00 cop table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int);
|
|
explain select * from t where _tidb_rowid = 0;
|
|
id count task operator info
|
|
Projection_4 8000.00 root test.t.a
|
|
└─TableReader_6 10000.00 root data:TableScan_5
|
|
└─TableScan_5 10000.00 cop table:t, range:[0,0], keep order:false, stats:pseudo
|
|
explain select * from t where _tidb_rowid > 0;
|
|
id count task operator info
|
|
Projection_4 8000.00 root test.t.a
|
|
└─TableReader_6 10000.00 root data:TableScan_5
|
|
└─TableScan_5 10000.00 cop table:t, range:(0,+inf], keep order:false, stats:pseudo
|
|
explain select a, _tidb_rowid from t where a > 0;
|
|
id count task operator info
|
|
TableReader_7 3333.33 root data:Selection_6
|
|
└─Selection_6 3333.33 cop gt(test.t.a, 0)
|
|
└─TableScan_5 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from t where _tidb_rowid > 0 and a > 0;
|
|
id count task operator info
|
|
Projection_4 2666.67 root test.t.a
|
|
└─TableReader_7 2666.67 root data:Selection_6
|
|
└─Selection_6 2666.67 cop gt(test.t.a, 0)
|
|
└─TableScan_5 3333.33 cop table:t, range:(0,+inf], keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, b int, c int);
|
|
explain select * from (select * from t order by (select 2)) t order by a, b;
|
|
id count task operator info
|
|
Sort_12 10000.00 root t.a:asc, t.b:asc
|
|
└─TableReader_18 10000.00 root data:TableScan_17
|
|
└─TableScan_17 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
explain select * from (select * from t order by c) t order by a, b;
|
|
id count task operator info
|
|
Sort_6 10000.00 root t.a:asc, t.b:asc
|
|
└─Sort_9 10000.00 root test.t.c:asc
|
|
└─TableReader_12 10000.00 root data:TableScan_11
|
|
└─TableScan_11 10000.00 cop table:t, range:[-inf,+inf], keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
set @@session.tidb_opt_insubq_to_join_and_agg=1;
|
|
explain SELECT 0 AS a FROM dual UNION SELECT 1 AS a FROM dual ORDER BY a;
|
|
id count task operator info
|
|
Sort_13 2.00 root a:asc
|
|
└─HashAgg_17 2.00 root group by:a, funcs:firstrow(join_agg_0)
|
|
└─Union_18 2.00 root
|
|
├─HashAgg_21 1.00 root group by:a, funcs:firstrow(a), firstrow(a)
|
|
│ └─Projection_22 1.00 root 0
|
|
│ └─TableDual_23 1.00 root rows:1
|
|
└─HashAgg_26 1.00 root group by:a, funcs:firstrow(a), firstrow(a)
|
|
└─Projection_27 1.00 root 1
|
|
└─TableDual_28 1.00 root rows:1
|
|
explain SELECT 0 AS a FROM dual UNION (SELECT 1 AS a FROM dual ORDER BY a)
|
|
id count task operator info
|
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HashAgg_15 2.00 root group by:a, funcs:firstrow(join_agg_0)
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└─Union_16 2.00 root
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├─HashAgg_19 1.00 root group by:a, funcs:firstrow(a), firstrow(a)
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│ └─Projection_20 1.00 root 0
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│ └─TableDual_21 1.00 root rows:1
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└─StreamAgg_26 1.00 root group by:a, funcs:firstrow(a), firstrow(a)
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└─Projection_31 1.00 root 1
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└─TableDual_32 1.00 root rows:1
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