973 lines
58 KiB
Plaintext
973 lines
58 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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create index expr_idx on t4((a+b+1));
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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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set @@session.tidb_hashagg_partial_concurrency = 1;
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set @@session.tidb_hashagg_final_concurrency = 1;
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set @@session.tidb_window_concurrency = 1;
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explain format = 'brief' select * from t3 where exists (select s.a from t3 s having sum(s.a) = t3.a );
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id estRows task access object operator info
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HashJoin 8000.00 root semi join, equal:[eq(Column#13, Column#11)]
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├─StreamAgg(Build) 1.00 root funcs:sum(Column#16)->Column#11
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│ └─TableReader 1.00 root data:StreamAgg
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│ └─StreamAgg 1.00 cop[tikv] funcs:sum(test.t3.a)->Column#16
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│ └─TableFullScan 10000.00 cop[tikv] table:s keep order:false, stats:pseudo
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└─Projection(Probe) 10000.00 root test.t3.a, test.t3.b, test.t3.c, test.t3.d, cast(test.t3.a, decimal(20,0) BINARY)->Column#13
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└─TableReader 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t3 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1;
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id estRows task access object operator info
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TableReader 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 order by c2;
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id estRows task access object operator info
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IndexLookUp 10000.00 root
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├─IndexFullScan(Build) 10000.00 cop[tikv] table:t1, index:c2(c2) keep order:true, stats:pseudo
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└─TableRowIDScan(Probe) 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select * from t2 order by c2;
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id estRows task access object operator info
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Sort 10000.00 root test.t2.c2
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└─TableReader 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 where t1.c1 > 0;
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id estRows task access object operator info
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TableReader 3333.33 root data:TableRangeScan
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└─TableRangeScan 3333.33 cop[tikv] table:t1 range:(0,+inf], keep order:false, stats:pseudo
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explain format = 'brief' select t1.c1, t1.c2 from t1 where t1.c2 = 1;
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id estRows task access object operator info
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IndexReader 10.00 root index:IndexRangeScan
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└─IndexRangeScan 10.00 cop[tikv] table:t1, index:c2(c2) range:[1,1], keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 left join t2 on t1.c2 = t2.c1 where t1.c1 > 1;
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id estRows task access object operator info
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HashJoin 4166.67 root left outer join, equal:[eq(test.t1.c2, test.t2.c1)]
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├─TableReader(Build) 3333.33 root data:TableRangeScan
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│ └─TableRangeScan 3333.33 cop[tikv] table:t1 range:(1,+inf], keep order:false, stats:pseudo
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└─TableReader(Probe) 9990.00 root data:Selection
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└─Selection 9990.00 cop[tikv] not(isnull(test.t2.c1))
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└─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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explain format = 'brief' update t1 set t1.c2 = 2 where t1.c1 = 1;
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id estRows task access object operator info
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Update N/A root N/A
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└─Point_Get 1.00 root table:t1 handle:1
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explain format = 'brief' delete from t1 where t1.c2 = 1;
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id estRows task access object operator info
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Delete N/A root N/A
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└─IndexLookUp 10.00 root
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├─IndexRangeScan(Build) 10.00 cop[tikv] table:t1, index:c2(c2) range:[1,1], keep order:false, stats:pseudo
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└─TableRowIDScan(Probe) 10.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select count(b.c2) from t1 a, t2 b where a.c1 = b.c2 group by a.c1;
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id estRows task access object operator info
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Projection 9990.00 root Column#7
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└─HashJoin 9990.00 root inner join, equal:[eq(test.t1.c1, test.t2.c2)]
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├─HashAgg(Build) 7992.00 root group by:test.t2.c2, funcs:count(Column#9)->Column#8, funcs:firstrow(test.t2.c2)->test.t2.c2
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│ └─TableReader 7992.00 root data:HashAgg
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│ └─HashAgg 7992.00 cop[tikv] group by:test.t2.c2, funcs:count(test.t2.c2)->Column#9
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│ └─Selection 9990.00 cop[tikv] not(isnull(test.t2.c2))
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│ └─TableFullScan 10000.00 cop[tikv] table:b keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:a keep order:false, stats:pseudo
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explain format = 'brief' select * from t2 order by t2.c2 limit 0, 1;
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id estRows task access object operator info
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TopN 1.00 root test.t2.c2, offset:0, count:1
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└─TableReader 1.00 root data:TopN
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└─TopN 1.00 cop[tikv] test.t2.c2, offset:0, count:1
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└─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 where c1 > 1 and c2 = 1 and c3 < 1;
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id estRows task access object operator info
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IndexLookUp 11.08 root
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├─IndexRangeScan(Build) 33.33 cop[tikv] table:t1, index:c2(c2) range:(1 1,1 +inf], keep order:false, stats:pseudo
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└─Selection(Probe) 11.08 cop[tikv] lt(test.t1.c3, 1)
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└─TableRowIDScan 33.33 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 where c1 = 1 and c2 > 1;
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id estRows task access object operator info
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Selection 0.33 root gt(test.t1.c2, 1)
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└─Point_Get 1.00 root table:t1 handle:1
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explain format = 'brief' select sum(t1.c1 in (select c1 from t2)) from t1;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:sum(Column#13)->Column#11
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└─Projection 10000.00 root cast(Column#10, decimal(3,0) BINARY)->Column#13
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└─HashJoin 10000.00 root CARTESIAN left outer semi join, other cond:eq(test.t1.c1, test.t2.c1)
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├─IndexReader(Build) 10000.00 root index:IndexFullScan
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│ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select c1 from t1 where c1 in (select c2 from t2);
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id estRows task access object operator info
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HashJoin 9990.00 root inner join, equal:[eq(test.t1.c1, test.t2.c2)]
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├─HashAgg(Build) 7992.00 root group by:test.t2.c2, funcs:firstrow(test.t2.c2)->test.t2.c2
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│ └─TableReader 9990.00 root data:Selection
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│ └─Selection 9990.00 cop[tikv] not(isnull(test.t2.c2))
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│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select (select count(1) k from t1 s where s.c1 = t1.c1 having k != 0) from t1;
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id estRows task access object operator info
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Projection 12500.00 root ifnull(Column#10, 0)->Column#10
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└─MergeJoin 12500.00 root left outer join, left key:test.t1.c1, right key:test.t1.c1
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├─Projection(Build) 10000.00 root 1->Column#10, test.t1.c1
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│ └─TableReader 10000.00 root data:TableFullScan
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│ └─TableFullScan 10000.00 cop[tikv] table:s keep order:true, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:true, stats:pseudo
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explain format = 'brief' select * from information_schema.columns;
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id estRows task access object operator info
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MemTableScan 10000.00 root table:COLUMNS
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explain format = 'brief' select * from information_schema.columns where table_name = 'T1';
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id estRows task access object operator info
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MemTableScan 10000.00 root table:COLUMNS table_name:["t1"]
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explain format = 'brief' select * from information_schema.columns where table_schema = 'TEST' and table_name = 'T1' and column_name = 'c1';
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id estRows task access object operator info
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MemTableScan 10000.00 root table:COLUMNS table_schema:["test"], table_name:["t1"], column_name:["c1"]
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explain format = 'brief' select c2 = (select c2 from t2 where t1.c1 = t2.c1 order by c1 limit 1) from t1;
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id estRows task access object operator info
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Projection 10000.00 root eq(test.t1.c2, test.t2.c2)->Column#11
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└─Apply 10000.00 root CARTESIAN left outer join
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├─TableReader(Build) 10000.00 root data:TableFullScan
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│ └─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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└─Limit(Probe) 1.00 root offset:0, count:1
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└─Projection 1.00 root test.t2.c1, test.t2.c2
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└─IndexLookUp 1.00 root
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├─Limit(Build) 1.00 cop[tikv] offset:0, count:1
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│ └─IndexRangeScan 1.00 cop[tikv] table:t2, index:c1(c1) range: decided by [eq(test.t1.c1, test.t2.c1)], keep order:true, stats:pseudo
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└─TableRowIDScan(Probe) 1.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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explain format = 'brief' select * from t1 order by c1 desc limit 1;
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id estRows task access object operator info
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Limit 1.00 root offset:0, count:1
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└─TableReader 1.00 root data:Limit
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└─Limit 1.00 cop[tikv] offset:0, count:1
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└─TableFullScan 1.00 cop[tikv] table:t1 keep order:true, desc, stats:pseudo
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explain format = 'brief' select * from t4 use index(idx) where a > 1 and b > 1 and c > 1 limit 1;
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id estRows task access object operator info
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Limit 1.00 root offset:0, count:1
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└─IndexLookUp 1.00 root
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├─Selection(Build) 3.00 cop[tikv] gt(test.t4.b, 1)
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│ └─IndexRangeScan 9.00 cop[tikv] table:t4, index:idx(a, b) range:(1,+inf], keep order:false, stats:pseudo
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└─Limit(Probe) 1.00 cop[tikv] offset:0, count:1
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└─Selection 1.00 cop[tikv] gt(test.t4.c, 1)
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└─TableRowIDScan 3.00 cop[tikv] table:t4 keep order:false, stats:pseudo
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explain format = 'brief' select * from t4 where a > 1 and c > 1 limit 1;
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id estRows task access object operator info
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Limit 1.00 root offset:0, count:1
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└─TableReader 1.00 root data:Limit
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└─Limit 1.00 cop[tikv] offset:0, count:1
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└─Selection 1.00 cop[tikv] gt(test.t4.c, 1)
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└─TableRangeScan 3.00 cop[tikv] table:t4 range:(1,+inf], keep order:false, stats:pseudo
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explain format = 'brief' select ifnull(null, t1.c1) from t1;
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id estRows task access object operator info
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TableReader 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select if(10, t1.c1, t1.c2) from t1;
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id estRows task access object operator info
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TableReader 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select c1 from t2 union select c1 from t2 union all select c1 from t2;
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id estRows task access object operator info
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Union 26000.00 root
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├─HashAgg 16000.00 root group by:Column#10, funcs:firstrow(Column#12)->Column#10
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│ └─Union 16000.00 root
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│ ├─StreamAgg 8000.00 root group by:test.t2.c1, funcs:firstrow(test.t2.c1)->Column#12, funcs:firstrow(test.t2.c1)->Column#10
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│ │ └─IndexReader 10000.00 root index:IndexFullScan
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│ │ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:true, stats:pseudo
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│ └─StreamAgg 8000.00 root group by:test.t2.c1, funcs:firstrow(test.t2.c1)->Column#12, funcs:firstrow(test.t2.c1)->Column#10
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│ └─IndexReader 10000.00 root index:IndexFullScan
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│ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:true, stats:pseudo
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└─IndexReader 10000.00 root index:IndexFullScan
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└─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:false, stats:pseudo
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explain format = 'brief' select c1 from t2 union all select c1 from t2 union select c1 from t2;
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id estRows task access object operator info
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HashAgg 24000.00 root group by:Column#10, funcs:firstrow(Column#11)->Column#10
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└─Union 24000.00 root
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├─StreamAgg 8000.00 root group by:test.t2.c1, funcs:firstrow(test.t2.c1)->Column#11, funcs:firstrow(test.t2.c1)->Column#10
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│ └─IndexReader 10000.00 root index:IndexFullScan
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│ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:true, stats:pseudo
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├─StreamAgg 8000.00 root group by:test.t2.c1, funcs:firstrow(test.t2.c1)->Column#11, funcs:firstrow(test.t2.c1)->Column#10
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│ └─IndexReader 10000.00 root index:IndexFullScan
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│ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:true, stats:pseudo
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└─StreamAgg 8000.00 root group by:test.t2.c1, funcs:firstrow(test.t2.c1)->Column#11, funcs:firstrow(test.t2.c1)->Column#10
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└─IndexReader 10000.00 root index:IndexFullScan
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└─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:true, stats:pseudo
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select * from information_schema.tidb_indexes where table_name='t4';
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TABLE_SCHEMA TABLE_NAME NON_UNIQUE KEY_NAME SEQ_IN_INDEX COLUMN_NAME SUB_PART INDEX_COMMENT Expression INDEX_ID IS_VISIBLE CLUSTERED
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test t4 0 PRIMARY 1 a NULL NULL 0 YES YES
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test t4 1 idx 1 a NULL NULL 1 YES NO
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test t4 1 idx 2 b NULL NULL 1 YES NO
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test t4 1 expr_idx 1 NULL NULL `a` + `b` + 1 2 YES NO
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explain format = 'brief' select count(1) from (select count(1) from (select * from t1 where c3 = 100) k) k2;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:count(1)->Column#5
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└─StreamAgg 1.00 root funcs:count(Column#9)->Column#7
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└─TableReader 1.00 root data:StreamAgg
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└─StreamAgg 1.00 cop[tikv] funcs:count(1)->Column#9
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└─Selection 10.00 cop[tikv] eq(test.t1.c3, 100)
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select 1 from (select count(c2), count(c3) from t1) k;
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id estRows task access object operator info
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Projection 1.00 root 1->Column#6
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└─StreamAgg 1.00 root funcs:count(Column#14)->Column#9
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└─TableReader 1.00 root data:StreamAgg
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└─StreamAgg 1.00 cop[tikv] funcs:count(1)->Column#14
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select count(1) from (select max(c2), count(c3) as m from t1) k;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:count(1)->Column#6
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└─StreamAgg 1.00 root funcs:count(Column#13)->Column#8
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└─TableReader 1.00 root data:StreamAgg
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└─StreamAgg 1.00 cop[tikv] funcs:count(1)->Column#13
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select count(1) from (select count(c2) from t1 group by c3) k;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:count(1)->Column#5
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└─HashAgg 8000.00 root group by:test.t1.c3, funcs:count(Column#9)->Column#7
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└─TableReader 8000.00 root data:HashAgg
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└─HashAgg 8000.00 cop[tikv] group by:test.t1.c3, funcs:count(1)->Column#9
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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set @@session.tidb_opt_insubq_to_join_and_agg=0;
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explain format = 'brief' select sum(t1.c1 in (select c1 from t2)) from t1;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:sum(Column#13)->Column#11
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└─Projection 10000.00 root cast(Column#10, decimal(3,0) BINARY)->Column#13
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└─HashJoin 10000.00 root CARTESIAN left outer semi join, other cond:eq(test.t1.c1, test.t2.c1)
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├─IndexReader(Build) 10000.00 root index:IndexFullScan
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│ └─IndexFullScan 10000.00 cop[tikv] table:t2, index:c1(c1) keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select 1 in (select c2 from t2) from t1;
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id estRows task access object operator info
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HashJoin 10000.00 root CARTESIAN left outer semi join, other cond:eq(1, test.t2.c2)
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├─TableReader(Build) 10000.00 root data:TableFullScan
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│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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explain format = 'brief' select sum(6 in (select c2 from t2)) from t1;
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id estRows task access object operator info
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StreamAgg 1.00 root funcs:sum(Column#13)->Column#11
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└─Projection 10000.00 root cast(Column#10, decimal(3,0) BINARY)->Column#13
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└─HashJoin 10000.00 root CARTESIAN left outer semi join, other cond:eq(6, test.t2.c2)
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├─TableReader(Build) 10000.00 root data:TableFullScan
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│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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└─TableReader(Probe) 10000.00 root data:TableFullScan
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└─TableFullScan 10000.00 cop[tikv] table:t1 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_10 {
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subgraph cluster10{
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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_10" -> "Projection_21"
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"Projection_21" -> "HashJoin_20"
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"HashJoin_20" -> "TableReader_13"
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"HashJoin_20" -> "IndexReader_19"
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}
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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 = "cop"
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"TableFullScan_12"
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}
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subgraph cluster18{
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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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"IndexFullScan_18"
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}
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"TableReader_13" -> "TableFullScan_12"
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"IndexReader_19" -> "IndexFullScan_18"
|
|
}
|
|
|
|
explain format="dot" select 1 in (select c2 from t2) from t1;
|
|
dot contents
|
|
|
|
digraph HashJoin_8 {
|
|
subgraph cluster8{
|
|
node [style=filled, color=lightgrey]
|
|
color=black
|
|
label = "root"
|
|
"HashJoin_8" -> "TableReader_10"
|
|
"HashJoin_8" -> "TableReader_14"
|
|
}
|
|
subgraph cluster9{
|
|
node [style=filled, color=lightgrey]
|
|
color=black
|
|
label = "cop"
|
|
"TableFullScan_9"
|
|
}
|
|
subgraph cluster13{
|
|
node [style=filled, color=lightgrey]
|
|
color=black
|
|
label = "cop"
|
|
"TableFullScan_13"
|
|
}
|
|
"TableReader_10" -> "TableFullScan_9"
|
|
"TableReader_14" -> "TableFullScan_13"
|
|
}
|
|
|
|
drop table if exists t1, t2, t3, t4;
|
|
drop table if exists t;
|
|
create table t(a int primary key, b int, c int, index idx(b));
|
|
explain format = 'brief' 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;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root Column#17
|
|
└─Apply 10000.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─MergeJoin 12.50 root inner join, left key:test.t.a, right key:test.t.a
|
|
├─TableReader(Build) 1.00 root data:TableRangeScan
|
|
│ └─TableRangeScan 1.00 cop[tikv] table:t1 range: decided by [eq(test.t.a, test.t.a)], keep order:true, stats:pseudo
|
|
└─TableReader(Probe) 1.00 root data:TableRangeScan
|
|
└─TableRangeScan 1.00 cop[tikv] table:s range: decided by [eq(test.t.a, test.t.a)], keep order:true, stats:pseudo
|
|
explain format = 'brief' 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;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root Column#17
|
|
└─Apply 10000.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─IndexJoin 12.50 root inner join, inner:TableReader, outer key:test.t.a, inner key:test.t.a, equal cond:eq(test.t.a, test.t.a)
|
|
├─IndexReader(Build) 10.00 root index:IndexRangeScan
|
|
│ └─IndexRangeScan 10.00 cop[tikv] table:s, index:idx(b) range: decided by [eq(test.t.b, test.t.a)], keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 1.00 root data:TableRangeScan
|
|
└─TableRangeScan 1.00 cop[tikv] table:t1 range: decided by [test.t.a], keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
Projection 10000.00 root Column#17
|
|
└─Apply 10000.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─IndexJoin 12.49 root inner join, inner:TableReader, outer key:test.t.c, inner key:test.t.a, equal cond:eq(test.t.c, test.t.a)
|
|
├─IndexLookUp(Build) 9.99 root
|
|
│ ├─IndexRangeScan(Build) 10.00 cop[tikv] table:s, index:idx(b) range: decided by [eq(test.t.b, test.t.a)], keep order:false, stats:pseudo
|
|
│ └─Selection(Probe) 9.99 cop[tikv] not(isnull(test.t.c))
|
|
│ └─TableRowIDScan 10.00 cop[tikv] table:s keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 1.00 root data:TableRangeScan
|
|
└─TableRangeScan 1.00 cop[tikv] table:t1 range: decided by [test.t.c], keep order:false, stats:pseudo
|
|
insert into t values(1, 1, 1), (2, 2 ,2), (3, 3, 3), (4, 3, 4),(5,3,5);
|
|
analyze table t;
|
|
explain format = 'brief' select t.c in (select count(*) from t s, t t1 where s.b = t.a and s.b = 3 and s.a = t1.a) from t;
|
|
id estRows task access object operator info
|
|
Projection 5.00 root Column#17
|
|
└─Apply 5.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 5.00 root data:TableFullScan
|
|
│ └─TableFullScan 5.00 cop[tikv] table:t keep order:false
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─MergeJoin 2.40 root inner join, left key:test.t.a, right key:test.t.a
|
|
├─TableReader(Build) 4.00 root data:Selection
|
|
│ └─Selection 4.00 cop[tikv] eq(3, test.t.a)
|
|
│ └─TableFullScan 5.00 cop[tikv] table:t1 keep order:true
|
|
└─IndexReader(Probe) 2.40 root index:Selection
|
|
└─Selection 2.40 cop[tikv] eq(3, test.t.a)
|
|
└─IndexRangeScan 3.00 cop[tikv] table:s, index:idx(b) range:[3,3], keep order:true
|
|
explain format = 'brief' select t.c in (select count(*) from t s left join t t1 on s.a = t1.a where 3 = t.a and s.b = 3) from t;
|
|
id estRows task access object operator info
|
|
Projection 5.00 root Column#17
|
|
└─Apply 5.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 5.00 root data:TableFullScan
|
|
│ └─TableFullScan 5.00 cop[tikv] table:t keep order:false
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─MergeJoin 2.40 root left outer join, left key:test.t.a, right key:test.t.a
|
|
├─TableReader(Build) 4.00 root data:Selection
|
|
│ └─Selection 4.00 cop[tikv] eq(3, test.t.a)
|
|
│ └─TableFullScan 5.00 cop[tikv] table:t1 keep order:true
|
|
└─IndexReader(Probe) 2.40 root index:Selection
|
|
└─Selection 2.40 cop[tikv] eq(3, test.t.a)
|
|
└─IndexRangeScan 3.00 cop[tikv] table:s, index:idx(b) range:[3,3], keep order:true
|
|
explain format = 'brief' select t.c in (select count(*) from t s right join t t1 on s.a = t1.a where 3 = t.a and t1.b = 3) from t;
|
|
id estRows task access object operator info
|
|
Projection 5.00 root Column#17
|
|
└─Apply 5.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#16)
|
|
├─TableReader(Build) 5.00 root data:TableFullScan
|
|
│ └─TableFullScan 5.00 cop[tikv] table:t keep order:false
|
|
└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#16
|
|
└─MergeJoin 2.40 root right outer join, left key:test.t.a, right key:test.t.a
|
|
├─TableReader(Build) 4.00 root data:Selection
|
|
│ └─Selection 4.00 cop[tikv] eq(3, test.t.a)
|
|
│ └─TableFullScan 5.00 cop[tikv] table:s keep order:true
|
|
└─IndexReader(Probe) 2.40 root index:Selection
|
|
└─Selection 2.40 cop[tikv] eq(3, test.t.a)
|
|
└─IndexRangeScan 3.00 cop[tikv] table:t1, index:idx(b) range:[3,3], keep order:true
|
|
drop table if exists t;
|
|
create table t(a int unsigned not null);
|
|
explain format = 'brief' select t.a = '123455' from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root eq(test.t.a, 123455)->Column#3
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select t.a > '123455' from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root gt(test.t.a, 123455)->Column#3
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select t.a != '123455' from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root ne(test.t.a, 123455)->Column#3
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select t.a = 12345678912345678998789678687678.111 from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root 0->Column#3
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a bigint, b bigint, index idx(a, b));
|
|
explain format = 'brief' select * from t where a in (1, 2) and a in (1, 3);
|
|
id estRows task access object operator info
|
|
IndexReader 10.00 root index:IndexRangeScan
|
|
└─IndexRangeScan 10.00 cop[tikv] table:t, index:idx(a, b) range:[1,1], keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t where b in (1, 2) and b in (1, 3);
|
|
id estRows task access object operator info
|
|
TableReader 10.00 root data:Selection
|
|
└─Selection 10.00 cop[tikv] in(test.t.b, 1, 2), in(test.t.b, 1, 3)
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t where a = 1 and a = 1;
|
|
id estRows task access object operator info
|
|
IndexReader 10.00 root index:IndexRangeScan
|
|
└─IndexRangeScan 10.00 cop[tikv] table:t, index:idx(a, b) range:[1,1], keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t where a = 1 and a = 2;
|
|
id estRows task access object operator info
|
|
TableDual 8000.00 root rows:0
|
|
explain format = 'brief' select * from t where b = 1 and b = 2;
|
|
id estRows task access object operator info
|
|
TableDual 8000.00 root rows:0
|
|
explain format = 'brief' select * from t t1 join t t2 where t1.b = t2.b and t2.b is null;
|
|
id estRows task access object operator info
|
|
Projection 0.00 root test.t.a, test.t.b, test.t.a, test.t.b
|
|
└─HashJoin 0.00 root inner join, equal:[eq(test.t.b, test.t.b)]
|
|
├─TableReader(Build) 0.00 root data:Selection
|
|
│ └─Selection 0.00 cop[tikv] isnull(test.t.b), not(isnull(test.t.b))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t t1 where not exists (select * from t t2 where t1.b = t2.b);
|
|
id estRows task access object operator info
|
|
HashJoin 8000.00 root anti semi join, equal:[eq(test.t.b, test.t.b)]
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a bigint primary key);
|
|
explain format = 'brief' select * from t where a = 1 and a = 2;
|
|
id estRows task access object operator info
|
|
TableDual 8000.00 root rows:0
|
|
explain format = 'brief' select null or a > 1 from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root or(<nil>, gt(test.t.a, 1))->Column#2
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t where a = 1 for update;
|
|
id estRows task access object operator info
|
|
Point_Get 1.00 root table:t handle:1, lock
|
|
drop table if exists ta, tb;
|
|
create table ta (a varchar(20));
|
|
create table tb (a varchar(20));
|
|
begin;
|
|
insert tb values ('1');
|
|
explain format = 'brief' select * from ta where a = 1;
|
|
id estRows task access object operator info
|
|
TableReader 8000.00 root data:Selection
|
|
└─Selection 8000.00 cop[tikv] eq(cast(test.ta.a, double BINARY), 1)
|
|
└─TableFullScan 10000.00 cop[tikv] table:ta 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 format = 'brief' select t1.a, t1.b from t1 left outer join t2 on t1.a = t2.a;
|
|
id estRows task access object operator info
|
|
IndexReader 10000.00 root index:IndexFullScan
|
|
└─IndexFullScan 10000.00 cop[tikv] table:t1, index:PRIMARY(a, b) keep order:false, stats:pseudo
|
|
explain format = 'brief' select distinct t1.a, t1.b from t1 left outer join t2 on t1.a = t2.a;
|
|
id estRows task access object operator info
|
|
IndexReader 10000.00 root index:IndexFullScan
|
|
└─IndexFullScan 10000.00 cop[tikv] table:t1, index:PRIMARY(a, b) keep order:false, stats:pseudo
|
|
CREATE TABLE `test01` (
|
|
`id` bigint(20) NOT NULL AUTO_INCREMENT,
|
|
`stat_date` int(11) NOT NULL DEFAULT '0',
|
|
`show_date` varchar(20) NOT NULL DEFAULT '',
|
|
`region_id` bigint(20) unsigned NOT NULL DEFAULT '0',
|
|
`period` tinyint(3) unsigned NOT NULL DEFAULT '0',
|
|
`registration_num` bigint(20) unsigned NOT NULL DEFAULT '0',
|
|
PRIMARY KEY (`id`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
|
|
CREATE TABLE `test02` (
|
|
`id` bigint(20) NOT NULL AUTO_INCREMENT,
|
|
`region_name` varchar(128) DEFAULT NULL,
|
|
PRIMARY KEY (`id`)
|
|
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
|
|
explain format = 'brief' SELECT COUNT(1) FROM (SELECT COALESCE(b.region_name, '不详') region_name, SUM(a.registration_num) registration_num FROM (SELECT stat_date, show_date, region_id, 0 registration_num FROM test01 WHERE period = 1 AND stat_date >= 20191202 AND stat_date <= 20191202 UNION ALL SELECT stat_date, show_date, region_id, registration_num registration_num FROM test01 WHERE period = 1 AND stat_date >= 20191202 AND stat_date <= 20191202) a LEFT JOIN test02 b ON a.region_id = b.id WHERE registration_num > 0 AND a.stat_date >= '20191202' AND a.stat_date <= '20191202' GROUP BY a.stat_date , a.show_date , COALESCE(b.region_name, '不详') ) JLS;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:count(1)->Column#22
|
|
└─HashAgg 8000.00 root group by:Column#32, Column#33, Column#34, funcs:count(1)->Column#31
|
|
└─Projection 10000.01 root Column#14, Column#15, coalesce(test.test02.region_name, 不详)->Column#34
|
|
└─HashJoin 10000.01 root left outer join, equal:[eq(Column#16, test.test02.id)]
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:b keep order:false, stats:pseudo
|
|
└─Union(Probe) 8000.01 root
|
|
├─TableDual 8000.00 root rows:0
|
|
└─Projection 0.01 root test.test01.stat_date, test.test01.show_date, test.test01.region_id
|
|
└─TableReader 0.01 root data:Selection
|
|
└─Selection 0.01 cop[tikv] eq(test.test01.period, 1), ge(test.test01.stat_date, 20191202), gt(cast(test.test01.registration_num, bigint(20) BINARY), 0), le(test.test01.stat_date, 20191202)
|
|
└─TableFullScan 10000.00 cop[tikv] table:test01 keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, nb int not null, nc int not null);
|
|
explain format = 'brief' select ifnull(a, 0) from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root ifnull(test.t.a, 0)->Column#5
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select ifnull(nb, 0) from t;
|
|
id estRows task access object operator info
|
|
TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select ifnull(nb, 0), ifnull(nc, 0) from t;
|
|
id estRows task access object operator info
|
|
TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select ifnull(a, 0), ifnull(nb, 0) from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root ifnull(test.t.a, 0)->Column#5, test.t.nb
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select ifnull(nb, 0), ifnull(nb, 0) from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root test.t.nb, test.t.nb
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select 1+ifnull(nb, 0) from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root plus(1, test.t.nb)->Column#5
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select 1+ifnull(a, 0) from t;
|
|
id estRows task access object operator info
|
|
Projection 10000.00 root plus(1, ifnull(test.t.a, 0))->Column#5
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select 1+ifnull(nb, 0) from t where nb=1;
|
|
id estRows task access object operator info
|
|
Projection 10.00 root plus(1, test.t.nb)->Column#5
|
|
└─TableReader 10.00 root data:Selection
|
|
└─Selection 10.00 cop[tikv] eq(test.t.nb, 1)
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
HashJoin 8320.83 root left outer join, equal:[eq(test.t.nb, test.t.nb)], left cond:[gt(test.t.a, 1)]
|
|
├─TableReader(Build) 6656.67 root data:Selection
|
|
│ └─Selection 6656.67 cop[tikv] or(test.t.nb, 0)
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:tb keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 6656.67 root data:Selection
|
|
└─Selection 6656.67 cop[tikv] or(test.t.nb, 0)
|
|
└─TableFullScan 10000.00 cop[tikv] table:ta keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
HashJoin 6656.67 root right outer join, equal:[eq(test.t.nb, test.t.nb)]
|
|
├─TableReader(Build) 2218.89 root data:Selection
|
|
│ └─Selection 2218.89 cop[tikv] gt(test.t.a, 1), or(test.t.nb, 0)
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:ta keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 6656.67 root data:Selection
|
|
└─Selection 6656.67 cop[tikv] or(test.t.nb, 0)
|
|
└─TableFullScan 10000.00 cop[tikv] table:tb keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
HashJoin 2773.61 root inner join, equal:[eq(test.t.nb, test.t.nb)]
|
|
├─TableReader(Build) 2218.89 root data:Selection
|
|
│ └─Selection 2218.89 cop[tikv] gt(test.t.a, 1), or(test.t.nb, 0)
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:ta keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 6656.67 root data:Selection
|
|
└─Selection 6656.67 cop[tikv] or(test.t.nb, 0)
|
|
└─TableFullScan 10000.00 cop[tikv] table:tb keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
Projection 10000.00 root Column#22
|
|
└─Apply 10000.00 root left outer semi join, equal:[eq(test.t.nc, Column#21)]
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─HashAgg(Probe) 1.00 root funcs:count(Column#23)->Column#21
|
|
└─HashJoin 9.99 root inner join, equal:[eq(test.t.a, test.t.a)]
|
|
├─HashAgg(Build) 7.99 root group by:test.t.a, funcs:count(Column#24)->Column#23, funcs:firstrow(test.t.a)->test.t.a
|
|
│ └─TableReader 7.99 root data:HashAgg
|
|
│ └─HashAgg 7.99 cop[tikv] group by:test.t.a, funcs:count(1)->Column#24
|
|
│ └─Selection 9.99 cop[tikv] eq(test.t.a, test.t.a), not(isnull(test.t.a))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9.99 root data:Selection
|
|
└─Selection 9.99 cop[tikv] eq(test.t.a, test.t.a), not(isnull(test.t.a))
|
|
└─TableFullScan 10000.00 cop[tikv] table:s keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
Selection 10000.00 root or(ifnull(test.t.a, 1), isnull(test.t.a))
|
|
└─HashJoin 12500.00 root left outer join, equal:[eq(test.t.nb, test.t.nb)], left cond:[gt(test.t.a, 1)]
|
|
├─TableReader(Build) 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:tb keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:ta keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
HashJoin 8002.00 root right outer join, equal:[eq(test.t.nb, test.t.nb)]
|
|
├─TableReader(Build) 3333.33 root data:Selection
|
|
│ └─Selection 3333.33 cop[tikv] gt(test.t.a, 1)
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:ta keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 8002.00 root data:Selection
|
|
└─Selection 8002.00 cop[tikv] or(ifnull(test.t.a, 1), isnull(test.t.a))
|
|
└─TableFullScan 10000.00 cop[tikv] table:tb keep order:false, stats:pseudo
|
|
explain format = 'brief' 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 estRows task access object operator info
|
|
Projection 10000.00 root Column#22
|
|
└─Apply 10000.00 root left outer semi join, equal:[eq(Column#23, Column#21)]
|
|
├─Projection(Build) 10000.00 root test.t.a, ifnull(test.t.a, 1)->Column#23
|
|
│ └─TableReader 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─HashAgg(Probe) 1.00 root funcs:count(Column#25)->Column#21
|
|
└─HashJoin 9.99 root inner join, equal:[eq(test.t.a, test.t.a)]
|
|
├─HashAgg(Build) 7.99 root group by:test.t.a, funcs:count(Column#26)->Column#25, funcs:firstrow(test.t.a)->test.t.a
|
|
│ └─TableReader 7.99 root data:HashAgg
|
|
│ └─HashAgg 7.99 cop[tikv] group by:test.t.a, funcs:count(1)->Column#26
|
|
│ └─Selection 9.99 cop[tikv] eq(test.t.a, test.t.a), not(isnull(test.t.a))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9.99 root data:Selection
|
|
└─Selection 9.99 cop[tikv] eq(test.t.a, test.t.a), not(isnull(test.t.a))
|
|
└─TableFullScan 10000.00 cop[tikv] table:s keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int);
|
|
explain format = 'brief' select * from t where _tidb_rowid = 0;
|
|
id estRows task access object operator info
|
|
Point_Get 1.00 root table:t handle:0
|
|
explain format = 'brief' select * from t where _tidb_rowid > 0;
|
|
id estRows task access object operator info
|
|
Projection 8000.00 root test.t.a
|
|
└─TableReader 10000.00 root data:TableRangeScan
|
|
└─TableRangeScan 10000.00 cop[tikv] table:t range:(0,+inf], keep order:false, stats:pseudo
|
|
explain format = 'brief' select a, _tidb_rowid from t where a > 0;
|
|
id estRows task access object operator info
|
|
TableReader 3333.33 root data:Selection
|
|
└─Selection 3333.33 cop[tikv] gt(test.t.a, 0)
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from t where _tidb_rowid > 0 and a > 0;
|
|
id estRows task access object operator info
|
|
Projection 2666.67 root test.t.a
|
|
└─TableReader 2666.67 root data:Selection
|
|
└─Selection 2666.67 cop[tikv] gt(test.t.a, 0)
|
|
└─TableRangeScan 3333.33 cop[tikv] 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 format = 'brief' select * from (select * from t order by (select 2)) t order by a, b;
|
|
id estRows task access object operator info
|
|
Sort 10000.00 root test.t.a, test.t.b
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select * from (select * from t order by c) t order by a, b;
|
|
id estRows task access object operator info
|
|
Sort 10000.00 root test.t.a, test.t.b
|
|
└─Sort 10000.00 root test.t.c
|
|
└─TableReader 10000.00 root data:TableFullScan
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
set @@session.tidb_opt_insubq_to_join_and_agg=1;
|
|
explain format = 'brief' SELECT 0 AS a FROM dual UNION SELECT 1 AS a FROM dual ORDER BY a;
|
|
id estRows task access object operator info
|
|
Sort 2.00 root Column#3
|
|
└─HashAgg 2.00 root group by:Column#3, funcs:firstrow(Column#6)->Column#3
|
|
└─Union 2.00 root
|
|
├─HashAgg 1.00 root group by:1, funcs:firstrow(0)->Column#6, funcs:firstrow(0)->Column#3
|
|
│ └─TableDual 1.00 root rows:1
|
|
└─HashAgg 1.00 root group by:1, funcs:firstrow(1)->Column#6, funcs:firstrow(1)->Column#3
|
|
└─TableDual 1.00 root rows:1
|
|
explain format = 'brief' SELECT 0 AS a FROM dual UNION (SELECT 1 AS a FROM dual ORDER BY a);
|
|
id estRows task access object operator info
|
|
HashAgg 2.00 root group by:Column#3, funcs:firstrow(Column#6)->Column#3
|
|
└─Union 2.00 root
|
|
├─HashAgg 1.00 root group by:1, funcs:firstrow(0)->Column#6, funcs:firstrow(0)->Column#3
|
|
│ └─TableDual 1.00 root rows:1
|
|
└─StreamAgg 1.00 root group by:Column#2, funcs:firstrow(Column#2)->Column#6, funcs:firstrow(Column#2)->Column#3
|
|
└─Projection 1.00 root 1->Column#2
|
|
└─TableDual 1.00 root rows:1
|
|
create table t (i int key, j int, unique key (i, j));
|
|
begin;
|
|
insert into t values (1, 1);
|
|
explain format = 'brief' update t set j = -j where i = 1 and j = 1;
|
|
id estRows task access object operator info
|
|
Update N/A root N/A
|
|
└─Selection 1.00 root eq(test.t.j, 1)
|
|
└─Point_Get 1.00 root table:t handle:1
|
|
rollback;
|
|
drop table if exists t;
|
|
create table t(a int);
|
|
begin;
|
|
insert into t values (1);
|
|
explain format = 'brief' select * from t left outer join t t1 on t.a = t1.a where t.a not between 1 and 2;
|
|
id estRows task access object operator info
|
|
HashJoin 8320.83 root left outer join, equal:[eq(test.t.a, test.t.a)]
|
|
├─UnionScan(Build) 6656.67 root not(and(ge(test.t.a, 1), le(test.t.a, 2))), not(isnull(test.t.a))
|
|
│ └─TableReader 6656.67 root data:Selection
|
|
│ └─Selection 6656.67 cop[tikv] not(isnull(test.t.a)), or(lt(test.t.a, 1), gt(test.t.a, 2))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
└─UnionScan(Probe) 6656.67 root not(and(ge(test.t.a, 1), le(test.t.a, 2)))
|
|
└─TableReader 6656.67 root data:Selection
|
|
└─Selection 6656.67 cop[tikv] or(lt(test.t.a, 1), gt(test.t.a, 2))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
rollback;
|
|
drop table if exists t;
|
|
create table t(a time, b date);
|
|
insert into t values (1, "1000-01-01"), (2, "1000-01-02"), (3, "1000-01-03");
|
|
analyze table t;
|
|
explain format = 'brief' select * from t where a = 1;
|
|
id estRows task access object operator info
|
|
TableReader 1.00 root data:Selection
|
|
└─Selection 1.00 cop[tikv] eq(test.t.a, 00:00:01.000000)
|
|
└─TableFullScan 3.00 cop[tikv] table:t keep order:false
|
|
explain format = 'brief' select * from t where b = "1000-01-01";
|
|
id estRows task access object operator info
|
|
TableReader 1.00 root data:Selection
|
|
└─Selection 1.00 cop[tikv] eq(test.t.b, 1000-01-01 00:00:00.000000)
|
|
└─TableFullScan 3.00 cop[tikv] table:t keep order:false
|
|
drop table t;
|
|
create table t(a int);
|
|
insert into t values (1),(2),(2),(2),(9),(9),(9),(10);
|
|
analyze table t with 1 buckets;
|
|
explain format = 'brief' select * from t where a >= 3 and a <= 8;
|
|
id estRows task access object operator info
|
|
TableReader 0.00 root data:Selection
|
|
└─Selection 0.00 cop[tikv] ge(test.t.a, 3), le(test.t.a, 8)
|
|
└─TableFullScan 8.00 cop[tikv] table:t keep order:false
|
|
drop table t;
|
|
create table t(a int, b int, index idx_ab(a, b));
|
|
explain format = 'brief' select a, b from t where a in (1) order by b;
|
|
id estRows task access object operator info
|
|
IndexReader 10.00 root index:IndexRangeScan
|
|
└─IndexRangeScan 10.00 cop[tikv] table:t, index:idx_ab(a, b) range:[1,1], keep order:true, stats:pseudo
|
|
explain format = 'brief' select a, b from t where a = 1 order by b;
|
|
id estRows task access object operator info
|
|
IndexReader 10.00 root index:IndexRangeScan
|
|
└─IndexRangeScan 10.00 cop[tikv] table:t, index:idx_ab(a, b) range:[1,1], keep order:true, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, b int);
|
|
explain format = 'brief' select a, b from (select a, b, avg(b) over (partition by a)as avg_b from t) as tt where a > 10 and b < 10 and a > avg_b;
|
|
id estRows task access object operator info
|
|
Projection 2666.67 root test.t.a, test.t.b
|
|
└─Selection 2666.67 root gt(cast(test.t.a, decimal(20,0) BINARY), Column#5), lt(test.t.b, 10)
|
|
└─Window 3333.33 root avg(cast(test.t.b, decimal(15,4) BINARY))->Column#5 over(partition by test.t.a)
|
|
└─Sort 3333.33 root test.t.a
|
|
└─TableReader 3333.33 root data:Selection
|
|
└─Selection 3333.33 cop[tikv] gt(test.t.a, 10)
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, b int);
|
|
explain format="dot" select * from t where a < 2;
|
|
dot contents
|
|
|
|
digraph TableReader_7 {
|
|
subgraph cluster7{
|
|
node [style=filled, color=lightgrey]
|
|
color=black
|
|
label = "root"
|
|
"TableReader_7"
|
|
}
|
|
subgraph cluster6{
|
|
node [style=filled, color=lightgrey]
|
|
color=black
|
|
label = "cop"
|
|
"Selection_6" -> "TableFullScan_5"
|
|
}
|
|
"TableReader_7" -> "Selection_6"
|
|
}
|
|
|
|
drop table if exists t;
|
|
create table t(a binary(16) not null, b varchar(2) default null, c varchar(100) default 'aaaa', key (a,b));
|
|
explain format = 'brief' select * from t where a=x'FA34E1093CB428485734E3917F000000' and b='xb';
|
|
id estRows task access object operator info
|
|
IndexLookUp 0.10 root
|
|
├─IndexRangeScan(Build) 0.10 cop[tikv] table:t, index:a(a, b) range:[0xFA34E1093CB428485734E3917F000000 "xb",0xFA34E1093CB428485734E3917F000000 "xb"], keep order:false, stats:pseudo
|
|
└─TableRowIDScan(Probe) 0.10 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' update t set c = 'ssss' where a=x'FA34E1093CB428485734E3917F000000' and b='xb';
|
|
id estRows task access object operator info
|
|
Update N/A root N/A
|
|
└─IndexLookUp 0.10 root
|
|
├─IndexRangeScan(Build) 0.10 cop[tikv] table:t, index:a(a, b) range:[0xFA34E1093CB428485734E3917F000000 "xb",0xFA34E1093CB428485734E3917F000000 "xb"], keep order:false, stats:pseudo
|
|
└─TableRowIDScan(Probe) 0.10 cop[tikv] table:t keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a int, b int);
|
|
explain format = 'brief' select (select count(n.a) from t) from t n;
|
|
id estRows task access object operator info
|
|
Projection 1.00 root Column#11
|
|
└─Apply 1.00 root CARTESIAN left outer join
|
|
├─StreamAgg(Build) 1.00 root funcs:count(test.t.a)->Column#7
|
|
│ └─TableReader 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:n keep order:false, stats:pseudo
|
|
└─MaxOneRow(Probe) 1.00 root
|
|
└─Projection 2.00 root Column#7
|
|
└─TableReader 2.00 root data:TableFullScan
|
|
└─TableFullScan 2.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select (select sum((select count(a)))) from t;
|
|
id estRows task access object operator info
|
|
Projection 1.00 root Column#7
|
|
└─Apply 1.00 root CARTESIAN left outer join
|
|
├─StreamAgg(Build) 1.00 root funcs:count(test.t.a)->Column#5
|
|
│ └─TableReader 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─HashAgg(Probe) 1.00 root funcs:sum(Column#12)->Column#7
|
|
└─HashJoin 1.00 root CARTESIAN left outer join
|
|
├─HashAgg(Build) 1.00 root group by:1, funcs:sum(Column#14)->Column#12
|
|
│ └─Projection 1.00 root cast(Column#6, decimal(20,0) BINARY)->Column#14
|
|
│ └─MaxOneRow 1.00 root
|
|
│ └─Projection 1.00 root Column#5
|
|
│ └─TableDual 1.00 root rows:1
|
|
└─TableDual(Probe) 1.00 root rows:1
|
|
explain format = 'brief' select count(a) from t group by b order by (select count(a));
|
|
id estRows task access object operator info
|
|
Sort 8000.00 root Column#4
|
|
└─HashJoin 8000.00 root CARTESIAN left outer join
|
|
├─TableDual(Build) 1.00 root rows:1
|
|
└─HashAgg(Probe) 8000.00 root group by:test.t.b, funcs:count(Column#8)->Column#4
|
|
└─TableReader 8000.00 root data:HashAgg
|
|
└─HashAgg 8000.00 cop[tikv] group by:test.t.b, funcs:count(test.t.a)->Column#8
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain format = 'brief' select (select sum(count(a))) from t;
|
|
id estRows task access object operator info
|
|
Projection 1.00 root Column#5
|
|
└─Apply 1.00 root CARTESIAN left outer join
|
|
├─StreamAgg(Build) 1.00 root funcs:count(test.t.a)->Column#4
|
|
│ └─TableReader 10000.00 root data:TableFullScan
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
└─StreamAgg(Probe) 1.00 root funcs:sum(Column#7)->Column#5
|
|
└─Projection 1.00 root cast(Column#4, decimal(20,0) BINARY)->Column#7
|
|
└─TableDual 1.00 root rows:1
|
|
explain format = 'brief' select sum(a), (select sum(a)), count(a) from t group by b order by (select count(a));
|
|
id estRows task access object operator info
|
|
Projection 8000.00 root Column#4, Column#4, Column#5
|
|
└─Sort 8000.00 root Column#5
|
|
└─HashJoin 8000.00 root CARTESIAN left outer join
|
|
├─TableDual(Build) 1.00 root rows:1
|
|
└─HashJoin(Probe) 8000.00 root CARTESIAN left outer join
|
|
├─TableDual(Build) 1.00 root rows:1
|
|
└─HashAgg(Probe) 8000.00 root group by:test.t.b, funcs:sum(Column#13)->Column#4, funcs:count(Column#14)->Column#5
|
|
└─TableReader 8000.00 root data:HashAgg
|
|
└─HashAgg 8000.00 cop[tikv] group by:test.t.b, funcs:sum(test.t.a)->Column#13, funcs:count(test.t.a)->Column#14
|
|
└─TableFullScan 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
create table t(a tinyint, b smallint, c mediumint, d int, e bigint);
|
|
insert into mysql.opt_rule_blacklist VALUES("aggregation_push_down");
|
|
admin reload opt_rule_blacklist;
|
|
|
|
explain format = 'brief' select sum(t1.a) from t t1 join t t2 on t1.a=t2.a;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:sum(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.a, decimal(3,0) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.a, test.t.a)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select sum(t1.b) from t t1 join t t2 on t1.b=t2.b;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:sum(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.b, decimal(5,0) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.b, test.t.b)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select sum(t1.c) from t t1 join t t2 on t1.c=t2.c;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:sum(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.c, decimal(8,0) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.c, test.t.c)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.c))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.c))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select sum(t1.d) from t t1 join t t2 on t1.d=t2.d;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:sum(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.d, decimal(10,0) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.d, test.t.d)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.d))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.d))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select sum(t1.e) from t t1 join t t2 on t1.e=t2.e;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:sum(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.e, decimal(20,0) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.e, test.t.e)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.e))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.e))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select avg(t1.a) from t t1 join t t2 on t1.a=t2.a;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:avg(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.a, decimal(8,4) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.a, test.t.a)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select avg(t1.b) from t t1 join t t2 on t1.b=t2.b;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:avg(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.b, decimal(10,4) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.b, test.t.b)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select avg(t1.c) from t t1 join t t2 on t1.c=t2.c;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:avg(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.c, decimal(13,4) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.c, test.t.c)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.c))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.c))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select avg(t1.d) from t t1 join t t2 on t1.d=t2.d;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:avg(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.d, decimal(15,4) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.d, test.t.d)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.d))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.d))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain format = 'brief' select avg(t1.e) from t t1 join t t2 on t1.e=t2.e;
|
|
id estRows task access object operator info
|
|
StreamAgg 1.00 root funcs:avg(Column#14)->Column#13
|
|
└─Projection 12487.50 root cast(test.t.e, decimal(24,4) BINARY)->Column#14
|
|
└─HashJoin 12487.50 root inner join, equal:[eq(test.t.e, test.t.e)]
|
|
├─TableReader(Build) 9990.00 root data:Selection
|
|
│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.e))
|
|
│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader(Probe) 9990.00 root data:Selection
|
|
└─Selection 9990.00 cop[tikv] not(isnull(test.t.e))
|
|
└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
drop table if exists t;
|
|
delete from mysql.opt_rule_blacklist where name="aggregation_push_down";
|
|
admin reload opt_rule_blacklist;
|
|
|