49 lines
3.1 KiB
Plaintext
49 lines
3.1 KiB
Plaintext
drop table if exists t1;
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drop table if exists t2;
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create table t1(a bigint, b bigint);
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create table t2(a bigint, b bigint);
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set session tidb_hashagg_partial_concurrency = 1;
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set session tidb_hashagg_final_concurrency = 1;
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explain format = 'brief' select * from t1 where t1.a in (select t1.b + t2.b from t2);
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id estRows task access object operator info
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HashJoin 8000.00 root CARTESIAN semi join, other cond:eq(test.t1.a, plus(test.t1.b, test.t2.b))
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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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drop table if exists t;
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create table t(a int primary key, b int, c int, d int, index idx(b,c,d));
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insert into t values(1,1,1,1),(2,2,2,2),(3,2,2,2),(4,2,2,2),(5,2,2,2);
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analyze table t;
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explain format = 'brief' select t.c in (select count(*) from t s use index(idx), t t1 where s.b = 1 and s.c = 1 and s.d = t.a and s.a = t1.a) from t;
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id estRows task access object operator info
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Projection 5.00 root Column#22
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└─Apply 5.00 root CARTESIAN left outer semi join, other cond:eq(test.t.c, Column#21)
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├─TableReader(Build) 5.00 root data:TableFullScan
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│ └─TableFullScan 5.00 cop[tikv] table:t keep order:false
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└─StreamAgg(Probe) 1.00 root funcs:count(1)->Column#21
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└─IndexJoin 0.22 root inner join, inner:TableReader, outer key:test.t.a, inner key:test.t.a, equal cond:eq(test.t.a, test.t.a)
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├─IndexReader(Build) 0.45 root index:IndexRangeScan
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│ └─IndexRangeScan 0.45 cop[tikv] table:s, index:idx(b, c, d) range: decided by [eq(test.t.b, 1) eq(test.t.c, 1) eq(test.t.d, test.t.a)], keep order:false
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└─TableReader(Probe) 1.00 root data:TableRangeScan
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└─TableRangeScan 1.00 cop[tikv] table:t1 range: decided by [test.t.a], keep order:false
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drop table if exists t;
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create table t(a int, b int, c int);
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explain format = 'brief' select a from t t1 where t1.a = (select max(t2.a) from t t2 where t1.b=t2.b and t1.c=t2.b);
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id estRows task access object operator info
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HashJoin 7992.00 root inner join, equal:[eq(test.t.b, test.t.b) eq(test.t.c, test.t.b) eq(test.t.a, Column#9)]
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├─Selection(Build) 6393.60 root not(isnull(Column#9))
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│ └─HashAgg 7992.00 root group by:test.t.b, funcs:max(Column#10)->Column#9, funcs:firstrow(test.t.b)->test.t.b
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│ └─TableReader 7992.00 root data:HashAgg
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│ └─HashAgg 7992.00 cop[tikv] group by:test.t.b, funcs:max(test.t.a)->Column#10
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│ └─Selection 9990.00 cop[tikv] not(isnull(test.t.b))
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│ └─TableFullScan 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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└─TableReader(Probe) 9970.03 root data:Selection
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└─Selection 9970.03 cop[tikv] not(isnull(test.t.a)), not(isnull(test.t.b)), not(isnull(test.t.c))
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└─TableFullScan 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
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drop table if exists t1, t2;
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create table t1(a int(11));
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create table t2(a decimal(40,20) unsigned, b decimal(40,20));
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select count(*) as x from t1 group by a having x not in (select a from t2 where x = t2.b);
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x
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