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189 lines
10 KiB
189 lines
10 KiB
use test;
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drop table if exists t1, t2, t3;
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create table t1 (c1 int primary key, c2 int, c3 int, index c2 (c2));
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load stats 's/explain_easy_stats_t1.json';
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create table t2 (c1 int unique, c2 int);
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load stats 's/explain_easy_stats_t2.json';
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create table t3 (a bigint, b bigint, c bigint, d bigint);
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load stats 's/explain_easy_stats_t3.json';
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create table index_prune(a bigint(20) NOT NULL, b bigint(20) NOT NULL, c tinyint(4) NOT NULL, primary key(a, b), index idx_b_c_a(b, c, a));
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load stats 's/explain_easy_stats_index_prune.json';
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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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explain 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_12 1600.00 root semi join, equal:[eq(Column#13, Column#11)]
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├─StreamAgg_27(Build) 1.00 root funcs:sum(Column#16)->Column#11
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│ └─TableReader_28 1.00 root data:StreamAgg_19
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│ └─StreamAgg_19 1.00 cop[tikv] funcs:sum(test.t3.a)->Column#16
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│ └─TableFullScan_26 2000.00 cop[tikv] table:s keep order:false
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└─Projection_13(Probe) 2000.00 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_15 2000.00 root data:TableFullScan_14
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└─TableFullScan_14 2000.00 cop[tikv] table:t3 keep order:false
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explain select * from t1;
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id estRows task access object operator info
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TableReader_5 1999.00 root data:TableFullScan_4
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└─TableFullScan_4 1999.00 cop[tikv] table:t1 keep order:false
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explain select * from t1 order by c2;
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id estRows task access object operator info
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IndexLookUp_12 1999.00 root
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├─IndexFullScan_10(Build) 1999.00 cop[tikv] table:t1, index:c2(c2) keep order:true
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└─TableRowIDScan_11(Probe) 1999.00 cop[tikv] table:t1 keep order:false
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explain select * from t2 order by c2;
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id estRows task access object operator info
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Sort_4 1985.00 root test.t2.c2:asc
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└─TableReader_8 1985.00 root data:TableFullScan_7
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└─TableFullScan_7 1985.00 cop[tikv] table:t2 keep order:false
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explain select * from t1 where t1.c1 > 0;
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id estRows task access object operator info
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TableReader_6 1999.00 root data:TableRangeScan_5
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└─TableRangeScan_5 1999.00 cop[tikv] table:t1 range:(0,+inf], keep order:false
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explain 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_6 0.00 root index:IndexRangeScan_5
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└─IndexRangeScan_5 0.00 cop[tikv] table:t1, index:c2(c2) range:[1,1], keep order:false
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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 estRows task access object operator info
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HashJoin_15 2481.25 root left outer join, equal:[eq(test.t1.c2, test.t2.c1)]
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├─TableReader_29(Build) 1985.00 root data:Selection_28
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│ └─Selection_28 1985.00 cop[tikv] not(isnull(test.t2.c1))
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│ └─TableFullScan_27 1985.00 cop[tikv] table:t2 keep order:false
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└─TableReader_26(Probe) 1998.00 root data:TableRangeScan_25
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└─TableRangeScan_25 1998.00 cop[tikv] table:t1 range:(1,+inf], keep order:false
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explain 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_2 N/A root N/A
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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 estRows task access object operator info
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Delete_4 N/A root N/A
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└─IndexLookUp_11 0.00 root
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├─IndexRangeScan_9(Build) 0.00 cop[tikv] table:t1, index:c2(c2) range:[1,1], keep order:false
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└─TableRowIDScan_10(Probe) 0.00 cop[tikv] table:t1 keep order:false
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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 estRows task access object operator info
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Projection_11 1985.00 root cast(Column#8, bigint(21) BINARY)->Column#7
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└─HashJoin_17 1985.00 root inner join, equal:[eq(test.t1.c1, test.t2.c2)]
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├─HashAgg_21(Build) 1985.00 root group by:test.t2.c2, funcs:count(test.t2.c2)->Column#8, funcs:firstrow(test.t2.c2)->test.t2.c2
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│ └─TableReader_28 1985.00 root data:Selection_27
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│ └─Selection_27 1985.00 cop[tikv] not(isnull(test.t2.c2))
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│ └─TableFullScan_26 1985.00 cop[tikv] table:b keep order:false
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└─TableReader_30(Probe) 1999.00 root data:TableFullScan_29
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└─TableFullScan_29 1999.00 cop[tikv] table:a keep order:false
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explain 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_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[tikv] test.t2.c2:asc, offset:0, count:1
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└─TableFullScan_13 1985.00 cop[tikv] table:t2 keep order:false
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explain 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 0.00 root
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├─IndexRangeScan_8(Build) 0.00 cop[tikv] table:t1, index:c2(c2) range:(1 1,1 +inf], keep order:false
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└─Selection_10(Probe) 0.00 cop[tikv] lt(test.t1.c3, 1)
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└─TableRowIDScan_9 0.00 cop[tikv] table:t1 keep order:false
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explain 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_6 0.50 root gt(test.t1.c2, 1)
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└─Point_Get_5 1.00 root table:t1 handle:1
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explain 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_15 1985.00 root inner join, equal:[eq(test.t1.c1, test.t2.c2)]
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├─HashAgg_19(Build) 1985.00 root group by:test.t2.c2, funcs:firstrow(test.t2.c2)->test.t2.c2
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│ └─TableReader_26 1985.00 root data:Selection_25
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│ └─Selection_25 1985.00 cop[tikv] not(isnull(test.t2.c2))
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│ └─TableFullScan_24 1985.00 cop[tikv] table:t2 keep order:false
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└─TableReader_28(Probe) 1999.00 root data:TableFullScan_27
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└─TableFullScan_27 1999.00 cop[tikv] table:t1 keep order:false
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explain select * from information_schema.columns;
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id estRows task access object operator info
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MemTableScan_4 10000.00 root table:COLUMNS
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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 estRows task access object operator info
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Projection_12 1999.00 root eq(test.t1.c2, test.t2.c2)->Column#8
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└─Apply_14 1999.00 root CARTESIAN left outer join
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├─TableReader_16(Build) 1999.00 root data:TableFullScan_15
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│ └─TableFullScan_15 1999.00 cop[tikv] table:t1 keep order:false
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└─Projection_43(Probe) 1.00 root test.t2.c1, test.t2.c2
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└─IndexLookUp_42 1.00 root limit embedded(offset:0, count:1)
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├─Limit_41(Build) 1.00 cop[tikv] offset:0, count:1
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│ └─IndexRangeScan_39 1.25 cop[tikv] table:t2, index:c1(c1) range: decided by [eq(test.t1.c1, test.t2.c1)], keep order:true
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└─TableRowIDScan_40(Probe) 1.00 cop[tikv] table:t2 keep order:false, stats:pseudo
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explain 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_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[tikv] offset:0, count:1
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└─TableFullScan_18 1.00 cop[tikv] table:t1 keep order:true, desc
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set @@session.tidb_opt_insubq_to_join_and_agg=0;
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explain 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_7 1999.00 root CARTESIAN left outer semi join, other cond:eq(1, test.t2.c2)
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├─TableReader_13(Build) 1985.00 root data:TableFullScan_12
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│ └─TableFullScan_12 1985.00 cop[tikv] table:t2 keep order:false
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└─TableReader_9(Probe) 1999.00 root data:TableFullScan_8
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└─TableFullScan_8 1999.00 cop[tikv] table:t1 keep order:false
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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 HashJoin_7 {
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subgraph cluster7{
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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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"HashJoin_7" -> "TableReader_9"
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"HashJoin_7" -> "TableReader_13"
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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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"TableFullScan_8"
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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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"TableReader_9" -> "TableFullScan_8"
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"TableReader_13" -> "TableFullScan_12"
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}
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 LIMIT 1;
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id estRows task access object operator info
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Point_Get_1 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 LIMIT 0;
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id estRows task access object operator info
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TableDual_5 0.00 root rows:0
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 LIMIT 1, 1;
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id estRows task access object operator info
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Limit_9 1.00 root offset:1, count:1
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└─Point_Get_11 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 LIMIT 1, 0;
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id estRows task access object operator info
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Limit_9 0.00 root offset:1, count:0
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└─Point_Get_11 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 LIMIT 0, 1;
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id estRows task access object operator info
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Point_Get_1 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 ORDER BY a;
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id estRows task access object operator info
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Point_Get_1 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 GROUP BY b;
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id estRows task access object operator info
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Point_Get_1 1.00 root table:index_prune, index:PRIMARY(a, b)
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explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085526790 GROUP BY b ORDER BY a limit 1;
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id estRows task access object operator info
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Point_Get_1 1.00 root table:index_prune, index:PRIMARY(a, b)
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drop table if exists t1, t2, t3, index_prune;
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set @@session.tidb_opt_insubq_to_join_and_agg=1;
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drop table if exists tbl;
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create table tbl(column1 int, column2 int, index idx(column1, column2));
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load stats 's/explain_easy_stats_tbl_dnf.json';
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explain select * from tbl where (column1=0 and column2=1) or (column1=1 and column2=3) or (column1=2 and column2=5);
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id estRows task access object operator info
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IndexReader_6 3.00 root index:IndexRangeScan_5
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└─IndexRangeScan_5 3.00 cop[tikv] table:tbl, index:idx(column1, column2) range:[0 1,0 1], [1 3,1 3], [2 5,2 5], keep order:false
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