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https://github.com/MariaDB/server.git
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Merge branch '10.9' into 10.10
This commit is contained in:
Oleksandr Byelkin
@ -480,6 +480,11 @@ select * from v2 {
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}
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]
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},
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{
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"check_split_materialized": {
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"not_applicable": "no candidate field can be accessed through ref"
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}
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},
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{
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"best_join_order": ["t1"]
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},
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@ -827,6 +832,11 @@ explain select * from v1 {
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}
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]
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},
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{
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"check_split_materialized": {
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"not_applicable": "group list has no candidates"
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}
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},
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{
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"best_join_order": ["t1"]
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},
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@ -10343,6 +10353,110 @@ SET optimizer_trace=DEFAULT;
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DROP VIEW v;
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DROP TABLE t;
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#
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# MDEV-26301: Split optimization improvements: Optimizer Trace coverage
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#
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create table t1(a int, b int);
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insert into t1 select seq,seq from seq_1_to_5;
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create table t2(a int, b int, key(a));
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insert into t2
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select A.seq,B.seq from seq_1_to_25 A, seq_1_to_2 B;
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create table t3(a int, b int, key(a));
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insert into t3
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select A.seq,B.seq from seq_1_to_5 A, seq_1_to_3 B;
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analyze table t1,t2,t3 persistent for all;
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Table Op Msg_type Msg_text
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test.t1 analyze status Engine-independent statistics collected
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test.t1 analyze status OK
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test.t2 analyze status Engine-independent statistics collected
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test.t2 analyze status Table is already up to date
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test.t3 analyze status Engine-independent statistics collected
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test.t3 analyze status Table is already up to date
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create table t10 (
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grp_id int,
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col1 int,
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key(grp_id)
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);
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insert into t10
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select
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A.seq,
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B.seq
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from
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seq_1_to_100 A,
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seq_1_to_100 B;
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create table t11 (
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col1 int,
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col2 int
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);
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insert into t11
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select A.seq, A.seq from seq_1_to_10 A;
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analyze table t10,t11 persistent for all;
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Table Op Msg_type Msg_text
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test.t10 analyze status Engine-independent statistics collected
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test.t10 analyze status Table is already up to date
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test.t11 analyze status Engine-independent statistics collected
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test.t11 analyze status OK
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set optimizer_trace=1;
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explain
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select * from
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(
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(t1 left join t2 on t2.a=t1.b)
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left join t3 on t3.a=t1.b
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) left join (select grp_id, count(*)
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from t10 left join t11 on t11.col1=t10.col1
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group by grp_id) T on T.grp_id=t1.b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t1 ALL NULL NULL NULL NULL 5
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1 PRIMARY t2 ref a a 5 test.t1.b 2 Using where
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1 PRIMARY t3 ref a a 5 test.t1.b 3 Using where
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1 PRIMARY <derived2> ref key0 key0 5 test.t1.b 10 Using where
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2 LATERAL DERIVED t10 ref grp_id grp_id 5 test.t1.b 100
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2 LATERAL DERIVED t11 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
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select json_detailed(json_extract(trace, '$**.check_split_materialized')) as JS
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from information_schema.optimizer_trace;
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JS
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[
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{
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"split_candidates":
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["t10.grp_id"]
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}
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]
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select
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json_detailed(
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json_remove(
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json_extract(trace, '$**.choose_best_splitting')
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, '$[0].split_plan_search[0]'
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)
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) as JS
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from information_schema.optimizer_trace;
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JS
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[
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{
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"considered_keys":
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[
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{
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"table_name": "t10",
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"index": "grp_id",
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"rec_per_key": 100,
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"param_tables": 1
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}
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],
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"refills": 5,
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"spl_pd_boundary": 2,
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"split_plan_search":
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[],
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"lead_table": "t10",
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"index": "grp_id",
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"parts": 1,
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"split_sel": 0.001,
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"cost": 2535.968504,
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"unsplit_cost": 253440.0075,
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"records": 100,
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"chosen": true
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}
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]
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drop table t1,t2,t3,t10,t11;
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set optimizer_trace=DEFAULT;
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#
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# End of 10.4 tests
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#
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set optimizer_trace='enabled=on';
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@ -10763,79 +10877,83 @@ from
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information_schema.optimizer_trace;
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json_detailed(json_extract(trace, '$**.choose_best_splitting'))
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[
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[
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{
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"considered_execution_plans":
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[
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{
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"plan_prefix":
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[],
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"get_costs_for_tables":
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[
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{
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"best_access_path":
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{
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"considered_keys":
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[]
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},
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{
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"considered_keys":
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[
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{
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"table_name": "t2",
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"index": "idx_a",
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"rec_per_key": 1.8367,
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"param_tables": 1
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}
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],
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"refills": 4,
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"spl_pd_boundary": 2,
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"split_plan_search":
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[
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{
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"considered_execution_plans":
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[
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{
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"plan_prefix":
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[],
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"get_costs_for_tables":
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[
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{
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"table": "t2",
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"considered_access_paths":
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[
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{
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"access_type": "ref",
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"index": "idx_a",
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"used_range_estimates": false,
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"reason": "not available",
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"rows": 1.8367,
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"cost": 2.000585794,
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"chosen": true
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},
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{
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"type": "scan",
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"chosen": false,
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"cause": "cost"
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}
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],
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"chosen_access_method":
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"best_access_path":
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{
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"type": "ref",
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"records": 1.8367,
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"cost": 2.000585794,
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"uses_join_buffering": false
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"table": "t2",
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"considered_access_paths":
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[
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{
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"access_type": "ref",
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"index": "idx_a",
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"used_range_estimates": false,
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"reason": "not available",
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"rows": 1.8367,
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"cost": 2.000585794,
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"chosen": true
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},
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{
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"type": "scan",
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"chosen": false,
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"cause": "cost"
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}
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],
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"chosen_access_method":
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{
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"type": "ref",
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"records": 1.8367,
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"cost": 2.000585794,
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"uses_join_buffering": false
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}
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}
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}
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}
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]
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},
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{
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"plan_prefix":
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[],
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"table": "t2",
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"rows_for_plan": 1.8367,
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"cost_for_plan": 2.367925794,
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"cost_for_sorting": 1.8367
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}
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]
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},
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{
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"best_splitting":
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{
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"table": "t2",
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"key": "idx_a",
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"record_count": 4,
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"cost": 2.488945919,
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"unsplit_cost": 25.72361682
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]
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},
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{
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"plan_prefix":
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[],
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"table": "t2",
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"rows_for_plan": 1.8367,
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"cost_for_plan": 2.367925794,
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"cost_for_sorting": 1.8367
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}
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]
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}
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}
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]
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]
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select
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json_detailed(json_extract(trace, '$**.lateral_derived'))
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from
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information_schema.optimizer_trace;
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json_detailed(json_extract(trace, '$**.lateral_derived'))
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[
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{
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"startup_cost": 9.955783677,
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"splitting_cost": 2.488945919,
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"records": 1
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],
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"lead_table": "t2",
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"index": "idx_a",
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"parts": 1,
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"split_sel": 0.020407778,
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"cost": 2.488945919,
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"unsplit_cost": 25.72361682,
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"records": 1,
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"chosen": true
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}
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]
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drop table t1,t2;
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