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MDEV-26301 Split optimization refills temporary table too many times
This patch optimizes the number of refills for the lateral derived table to which a materialized derived table subject to split optimization is is converted. This optimized number of refills is now considered as the expected number of refills of the materialized derived table when searching for the best possible splitting of the table.
This commit is contained in:
Igor Babaev
committed by
Oleksandr Byelkin
Oleksandr Byelkin
parent
ec79f37718
commit
ce7ffe61d8
@ -284,3 +284,514 @@ id select_type table type possible_keys key key_len ref rows Extra
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2 DERIVED t4 ALL NULL NULL NULL NULL 40 Using filesort
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drop table t3, t4;
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# End of 10.3 tests
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#
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# MDEV-26301: Split optimization refills temporary table too many times
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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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explain
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select * from
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(t1 left join t2 on t2.a=t1.b) left join t3 on t3.a=t1.b;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 5
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1 SIMPLE t2 ref a a 5 test.t1.b 2 Using where
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1 SIMPLE t3 ref a a 5 test.t1.b 3 Using where
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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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explain 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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# The important part in the below output is:
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# "lateral": 1,
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# "query_block": {
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# "select_id": 2,
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# "r_loops": 5, <-- must be 5, not 30.
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analyze format=json 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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ANALYZE
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{
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"query_block": {
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"select_id": 1,
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"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"const_condition": "1",
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
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"rows": 5,
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"r_rows": 5,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100
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},
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"table": {
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"table_name": "t2",
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"access_type": "ref",
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"possible_keys": ["a"],
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"key": "a",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t1.b"],
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"r_loops": 5,
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"rows": 2,
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"r_rows": 2,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "trigcond(trigcond(t1.b is not null))"
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},
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"table": {
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"table_name": "t3",
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"access_type": "ref",
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"possible_keys": ["a"],
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"key": "a",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t1.b"],
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"r_loops": 10,
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"rows": 3,
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"r_rows": 3,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "trigcond(trigcond(t1.b is not null))"
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},
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"table": {
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"table_name": "<derived2>",
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"access_type": "ref",
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"possible_keys": ["key0"],
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"key": "key0",
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"key_length": "5",
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"used_key_parts": ["grp_id"],
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"ref": ["test.t1.b"],
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"r_loops": 30,
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"rows": 10,
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"r_rows": 1,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100,
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"attached_condition": "trigcond(trigcond(t1.b is not null))",
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"materialized": {
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"lateral": 1,
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"query_block": {
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"select_id": 2,
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"r_loops": 5,
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"r_total_time_ms": "REPLACED",
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"outer_ref_condition": "t1.b is not null",
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"table": {
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"table_name": "t10",
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"access_type": "ref",
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"possible_keys": ["grp_id"],
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"key": "grp_id",
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"key_length": "5",
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"used_key_parts": ["grp_id"],
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"ref": ["test.t1.b"],
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"r_loops": 5,
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"rows": 100,
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"r_rows": 100,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100
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},
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"block-nl-join": {
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"table": {
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"table_name": "t11",
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"access_type": "ALL",
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"r_loops": 5,
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"rows": 10,
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"r_rows": 10,
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"r_total_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100
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},
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"buffer_type": "flat",
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"buffer_size": "1Kb",
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"join_type": "BNL",
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"attached_condition": "trigcond(t11.col1 = t10.col1)",
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"r_filtered": 10
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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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create table t21 (pk int primary key);
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insert into t21 values (1),(2),(3);
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create table t22 (pk int primary key);
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insert into t22 values (1),(2),(3);
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explain
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select * from
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t21, t22,
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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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where
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t21.pk=1 and t22.pk=2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t21 const PRIMARY PRIMARY 4 const 1 Using index
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1 PRIMARY t22 const PRIMARY PRIMARY 4 const 1 Using index
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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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explain
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select * from
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t21,
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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
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t22 join t10 left join t11 on t11.col1=t10.col1
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where
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t22.pk=1
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group by grp_id) T on T.grp_id=t1.b
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where
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t21.pk=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t21 const PRIMARY PRIMARY 4 const 1 Using index
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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 t22 const PRIMARY PRIMARY 4 const 1 Using index
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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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create table t5 (
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pk int primary key
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);
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insert into t5 select seq from seq_1_to_1000;
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explain
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select * from
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t21,
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(
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(((t1 join t5 on t5.pk=t1.b)) 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
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t22 join t10 left join t11 on t11.col1=t10.col1
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where
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t22.pk=1
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group by grp_id) T on T.grp_id=t1.b
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where
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t21.pk=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY t21 const PRIMARY PRIMARY 4 const 1 Using index
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1 PRIMARY t1 ALL NULL NULL NULL NULL 5 Using where
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1 PRIMARY t5 eq_ref PRIMARY PRIMARY 4 test.t1.b 1 Using index
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1 PRIMARY t2 ref a a 5 test.t1.b 2
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1 PRIMARY t3 ref a a 5 test.t1.b 3
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1 PRIMARY <derived2> ref key0 key0 5 test.t1.b 10 Using where
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2 LATERAL DERIVED t22 const PRIMARY PRIMARY 4 const 1 Using index
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2 LATERAL DERIVED t10 ref grp_id grp_id 5 test.t5.pk 100 Using index condition
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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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drop table t1,t2,t3,t5, t10, t11, t21, t22;
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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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explain select *
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from
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(
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(t1 left join t2 on t2.a=t1.b)
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left join
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t3
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on t3.a=t1.b
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)
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left join
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(
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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
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)dt
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on dt.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 *
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from
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(
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(t1 left join t2 on t2.a=t1.b)
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left join
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t3
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on t3.a=t1.b
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)
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left join
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(
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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
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)dt
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on dt.grp_id=t1.b;
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a b a b a b grp_id count(*)
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1 1 1 1 1 1 1 100
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1 1 1 1 1 2 1 100
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1 1 1 1 1 3 1 100
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1 1 1 2 1 1 1 100
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1 1 1 2 1 2 1 100
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1 1 1 2 1 3 1 100
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2 2 2 1 2 1 2 100
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2 2 2 1 2 2 2 100
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2 2 2 1 2 3 2 100
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2 2 2 2 2 1 2 100
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2 2 2 2 2 2 2 100
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2 2 2 2 2 3 2 100
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3 3 3 1 3 1 3 100
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3 3 3 1 3 2 3 100
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3 3 3 1 3 3 3 100
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3 3 3 2 3 1 3 100
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3 3 3 2 3 2 3 100
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3 3 3 2 3 3 3 100
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4 4 4 1 4 1 4 100
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4 4 4 1 4 2 4 100
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4 4 4 1 4 3 4 100
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4 4 4 2 4 1 4 100
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4 4 4 2 4 2 4 100
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4 4 4 2 4 3 4 100
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5 5 5 1 5 1 5 100
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5 5 5 1 5 2 5 100
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5 5 5 1 5 3 5 100
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5 5 5 2 5 1 5 100
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5 5 5 2 5 2 5 100
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5 5 5 2 5 3 5 100
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set join_cache_level=4;
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explain select *
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from
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(
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(t1 left join t2 on t2.a=t1.b)
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left join
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t3
|
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on t3.a=t1.b
|
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)
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left join
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(
|
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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
|
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)dt
|
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on dt.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 hash_ALL NULL #hash#$hj 5 test.t10.col1 10 Using where; Using join buffer (flat, BNLH join)
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select *
|
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from
|
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(
|
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(t1 left join t2 on t2.a=t1.b)
|
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left join
|
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t3
|
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on t3.a=t1.b
|
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)
|
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left join
|
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(
|
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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
|
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)dt
|
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on dt.grp_id=t1.b;
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a b a b a b grp_id count(*)
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1 1 1 1 1 1 1 100
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1 1 1 1 1 2 1 100
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1 1 1 1 1 3 1 100
|
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1 1 1 2 1 1 1 100
|
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1 1 1 2 1 2 1 100
|
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1 1 1 2 1 3 1 100
|
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2 2 2 1 2 1 2 100
|
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2 2 2 1 2 2 2 100
|
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2 2 2 1 2 3 2 100
|
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2 2 2 2 2 1 2 100
|
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2 2 2 2 2 2 2 100
|
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2 2 2 2 2 3 2 100
|
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3 3 3 1 3 1 3 100
|
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3 3 3 1 3 2 3 100
|
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3 3 3 1 3 3 3 100
|
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3 3 3 2 3 1 3 100
|
||||
3 3 3 2 3 2 3 100
|
||||
3 3 3 2 3 3 3 100
|
||||
4 4 4 1 4 1 4 100
|
||||
4 4 4 1 4 2 4 100
|
||||
4 4 4 1 4 3 4 100
|
||||
4 4 4 2 4 1 4 100
|
||||
4 4 4 2 4 2 4 100
|
||||
4 4 4 2 4 3 4 100
|
||||
5 5 5 1 5 1 5 100
|
||||
5 5 5 1 5 2 5 100
|
||||
5 5 5 1 5 3 5 100
|
||||
5 5 5 2 5 1 5 100
|
||||
5 5 5 2 5 2 5 100
|
||||
5 5 5 2 5 3 5 100
|
||||
set join_cache_level=default;
|
||||
drop index a on t2;
|
||||
drop index a on t3;
|
||||
explain select *
|
||||
from
|
||||
(
|
||||
(t1 left join t2 on t2.a=t1.b)
|
||||
left join
|
||||
t3
|
||||
on t3.a=t1.b
|
||||
)
|
||||
left join
|
||||
(
|
||||
select grp_id, count(*)
|
||||
from t10 left join t11 on t11.col1=t10.col1
|
||||
group by grp_id
|
||||
)dt
|
||||
on dt.grp_id=t1.b;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t1 ALL NULL NULL NULL NULL 5
|
||||
1 PRIMARY t2 ALL NULL NULL NULL NULL 50 Using where; Using join buffer (flat, BNL join)
|
||||
1 PRIMARY t3 ALL NULL NULL NULL NULL 15 Using where; Using join buffer (incremental, BNL join)
|
||||
1 PRIMARY <derived2> ref key0 key0 5 test.t1.b 1000 Using where
|
||||
2 DERIVED t10 ALL grp_id NULL NULL NULL 10000 Using temporary; Using filesort
|
||||
2 DERIVED t11 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
|
||||
select *
|
||||
from
|
||||
(
|
||||
(t1 left join t2 on t2.a=t1.b)
|
||||
left join
|
||||
t3
|
||||
on t3.a=t1.b
|
||||
)
|
||||
left join
|
||||
(
|
||||
select grp_id, count(*)
|
||||
from t10 left join t11 on t11.col1=t10.col1
|
||||
group by grp_id
|
||||
)dt
|
||||
on dt.grp_id=t1.b;
|
||||
a b a b a b grp_id count(*)
|
||||
1 1 1 1 1 1 1 100
|
||||
1 1 1 2 1 1 1 100
|
||||
1 1 1 1 1 2 1 100
|
||||
1 1 1 2 1 2 1 100
|
||||
1 1 1 1 1 3 1 100
|
||||
1 1 1 2 1 3 1 100
|
||||
2 2 2 1 2 1 2 100
|
||||
2 2 2 2 2 1 2 100
|
||||
2 2 2 1 2 2 2 100
|
||||
2 2 2 2 2 2 2 100
|
||||
2 2 2 1 2 3 2 100
|
||||
2 2 2 2 2 3 2 100
|
||||
3 3 3 1 3 1 3 100
|
||||
3 3 3 2 3 1 3 100
|
||||
3 3 3 1 3 2 3 100
|
||||
3 3 3 2 3 2 3 100
|
||||
3 3 3 1 3 3 3 100
|
||||
3 3 3 2 3 3 3 100
|
||||
4 4 4 1 4 1 4 100
|
||||
4 4 4 2 4 1 4 100
|
||||
4 4 4 1 4 2 4 100
|
||||
4 4 4 2 4 2 4 100
|
||||
4 4 4 1 4 3 4 100
|
||||
4 4 4 2 4 3 4 100
|
||||
5 5 5 1 5 1 5 100
|
||||
5 5 5 2 5 1 5 100
|
||||
5 5 5 1 5 2 5 100
|
||||
5 5 5 2 5 2 5 100
|
||||
5 5 5 1 5 3 5 100
|
||||
5 5 5 2 5 3 5 100
|
||||
drop table t1,t2,t3;
|
||||
drop table t10, t11;
|
||||
# End of 10.4 tests
|
||||
|
||||
Reference in New Issue
Block a user