28 lines
1.8 KiB
Plaintext
28 lines
1.8 KiB
Plaintext
use test;
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drop table if exists e, lo;
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create table e(a int, b int, key idx_a(a), key idx_b(b)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
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load stats 's/explain_join_stats_e.json';
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create table lo(a int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (a)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin AUTO_INCREMENT=30002;
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load stats 's/explain_join_stats_lo.json';
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explain format = 'brief' select count(*) from e, lo where lo.a=e.a and e.b=22336;
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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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└─HashJoin 19977.00 root inner join, equal:[eq(test.lo.a, test.e.a)]
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├─TableReader(Build) 250.00 root data:TableFullScan
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│ └─TableFullScan 250.00 cop[tikv] table:lo keep order:false
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└─IndexLookUp(Probe) 19977.00 root
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├─IndexRangeScan(Build) 19977.00 cop[tikv] table:e, index:idx_b(b) range:[22336,22336], keep order:false
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└─Selection(Probe) 19977.00 cop[tikv] not(isnull(test.e.a))
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└─TableRowIDScan 19977.00 cop[tikv] table:e keep order:false
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explain format = 'brief' select /*+ TIDB_INLJ(e) */ count(*) from e, lo where lo.a=e.a and e.b=22336;
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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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└─IndexJoin 19977.00 root inner join, inner:IndexLookUp, outer key:test.lo.a, inner key:test.e.a, equal cond:eq(test.lo.a, test.e.a)
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├─TableReader(Build) 250.00 root data:TableFullScan
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│ └─TableFullScan 250.00 cop[tikv] table:lo keep order:false
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└─IndexLookUp(Probe) 79.91 root
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├─Selection(Build) 4080.00 cop[tikv] not(isnull(test.e.a))
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│ └─IndexRangeScan 4080.00 cop[tikv] table:e, index:idx_a(a) range: decided by [eq(test.e.a, test.lo.a)], keep order:false
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└─Selection(Probe) 79.91 cop[tikv] eq(test.e.b, 22336)
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└─TableRowIDScan 4080.00 cop[tikv] table:e keep order:false
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