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Fixed bug mdev-10454.
The patch actually fixes the old defect of the optimizer that could not extract keys for range access from IN predicates with row arguments. This problem was resolved in the mysql-5.7 code. The patch supersedes what was done there: - it can build range access when not all components of the first row argument are refer to the columns of the table for which the range access is constructed. - it can use equality predicates to build range access to the table that is not referred to in this argument.
This commit is contained in:
Igor Babaev
@ -2332,3 +2332,677 @@ DROP TABLE t1;
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#
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# End of 10.1 tests
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#
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#
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# MDEV-10454: range access keys extracted
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# from <row> IN (<row value list>)
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#
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create table t1(a int, b int, c varchar(16), key idx(a,b)) engine=myisam;
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insert into t1 values
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(1,1,'xx'), (2,2,'yyy'), (3,3,'zzzz'), (1,2,'zz'), (1,3,'x'),
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(2,3,'yy'), (4,5,'ww'), (7,8,'xxxxx'), (4,3,'zyx'), (1,2,'uuu'),
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(2,1,'w'), (5,5,'wx'), (2,3,'ww'), (7,7,'xxxyy'), (3,3,'zyxw'),
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(3,2,'uuuw'), (2,2,'wxz'), (5,5,'xw'), (12,12,'xx'), (12,12,'y'),
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(13,13,'z'), (11,12,'zz'), (11,13,'x'), (12,13,'y'), (14,15,'w'),
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(17,18,'xx'), (14,13,'zx'), (11,12,'u'), (12,11,'w'), (5,5,'wx'),
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(12,13,'ww'), (17,17,'xxxyy'), (13,13,'zyxw'), (13,12,'uuuw'), (12,12,'wxz'),
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(15,15,'xw'), (1,1,'xa'), (2,2,'yya'), (3,3,'zzza'), (1,2,'za'),
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(1,3,'xb'), (2,3,'ya'), (4,5,'wa'), (7,8,'xxxxa'), (4,3,'zya'),
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(1,2,'uua'), (2,1,'wb'), (5,5,'wc'), (2,3,'wa'), (7,7,'xxxya'),
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(3,3,'zyxa'), (3,2,'uuua'), (2,2,'wxa'), (5,5,'xa'), (12,12,'xa'),
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(22,12,'yb'), (23,13,'zb'), (21,12,'za'), (24,13,'c'), (32,13,'d'),
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(34,15,'wd'), (47,18,'xa'), (54,13,'za'), (51,12,'ub'), (52,11,'wc'),
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(5,5,'wd'), (62,13,'wa'), (67,17,'xxxya'), (63,13,'zyxa'), (73,12,'uuua'),
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(82,12,'wxa'), (85,15,'xd');
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# range access to t1 by 2-component keys for index idx
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explain select * from t1 where (a,b) IN ((2, 3),(3,3),(8,8),(7,7));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range idx idx 10 NULL 7 Using where
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explain format=json select * from t1 where (a,b) IN ((2, 3),(3,3),(8,8),(7,7));
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "10",
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"used_key_parts": ["a", "b"],
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"rows": 7,
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"filtered": 100,
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"attached_condition": "(t1.a,t1.b) in (<cache>((2,3)),<cache>((3,3)),<cache>((8,8)),<cache>((7,7)))"
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}
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}
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}
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select * from t1 where (a,b) IN ((2, 3),(3,3),(8,8),(7,7));
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a b c
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2 3 yy
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2 3 ww
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2 3 ya
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2 3 wa
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3 3 zzzz
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3 3 zyxw
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3 3 zzza
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3 3 zyxa
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7 7 xxxyy
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7 7 xxxya
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prepare stmt from "select * from t1 where (a,b) IN ((2, 3),(3,3),(8,8),(7,7))";
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execute stmt;
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a b c
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2 3 yy
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2 3 ww
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2 3 ya
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2 3 wa
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3 3 zzzz
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3 3 zyxw
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3 3 zzza
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3 3 zyxa
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7 7 xxxyy
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7 7 xxxya
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execute stmt;
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a b c
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2 3 yy
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2 3 ww
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2 3 ya
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2 3 wa
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3 3 zzzz
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3 3 zyxw
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3 3 zzza
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3 3 zyxa
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7 7 xxxyy
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7 7 xxxya
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deallocate prepare stmt;
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# range access to t1 by 1-component keys for index idx
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explain select * from t1 where (a,b+a) IN ((4,9),(8,8),(7,7));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range idx idx 5 NULL 5 Using where
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explain format=json select * from t1 where (a,b+a) IN ((4,9),(8,8),(7,7));
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "5",
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"used_key_parts": ["a"],
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"rows": 5,
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"filtered": 100,
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"attached_condition": "(t1.a,t1.b + t1.a) in (<cache>((4,9)),<cache>((8,8)),<cache>((7,7)))"
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}
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}
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}
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select * from t1 where (a,b+a) IN ((4,9),(8,8),(7,7));
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a b c
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4 5 ww
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4 5 wa
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# range access to t1 by 1-component keys for index idx
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explain select * from t1 where (a,b) IN ((4,a-1),(8,a+8),(7,a+7));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range idx idx 5 NULL 5 Using where
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explain format=json select * from t1 where (a,b) IN ((4,a-1),(8,a+8),(7,a+7));
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "5",
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"used_key_parts": ["a"],
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"rows": 5,
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"filtered": 100,
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"attached_condition": "(t1.a,t1.b) in ((4,t1.a - 1),(8,t1.a + 8),(7,t1.a + 7))"
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}
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}
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}
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select * from t1 where (a,b) IN ((4,a-1),(8,a+8),(7,a+7));
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a b c
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4 3 zyx
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4 3 zya
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set @save_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='index_merge=off';
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create table t2(
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d int, e int, key idx1(d), key idx2(e), f varchar(32)
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) engine=myisam;
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insert into t2 values
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(9,5,'a'), (9,8,'b'), (9,3,'c'), (9,2,'d'), (9,1,'e'),
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(6,5,'f'), (6,3,'g'), (6,7,'h'), (3,3,'i'), (6,2,'j'),
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(9,5,'aa'), (9,8,'ba'), (9,3,'ca'), (2,2,'da'), (9,1,'ea'),
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(6,5,'fa'), (6,3,'ga'), (6,7,'ha'), (9,3,'ia'), (6,2,'ja');
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# join order: (t2,t1) with ref access of t1
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# range access to t1 by keys for index idx1
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explain select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(2,2));
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range idx1,idx2 idx1 5 NULL 3 Using index condition; Using where
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1 SIMPLE t1 ref idx idx 5 test.t2.d 8
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explain format=json select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(2,2));
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t2",
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"access_type": "range",
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"possible_keys": ["idx1", "idx2"],
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"key": "idx1",
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"key_length": "5",
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"used_key_parts": ["d"],
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"rows": 3,
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"filtered": 100,
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"index_condition": "t2.d is not null",
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"attached_condition": "(t2.d,t2.e) in (<cache>((3,3)),<cache>((7,7)),<cache>((2,2)))"
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},
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"table": {
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"table_name": "t1",
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"access_type": "ref",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t2.d"],
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"rows": 8,
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"filtered": 100
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}
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}
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}
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select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(2,2));
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a b c d e f
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2 1 w 2 2 da
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2 1 wb 2 2 da
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2 2 yyy 2 2 da
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2 2 wxz 2 2 da
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2 2 yya 2 2 da
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2 2 wxa 2 2 da
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2 3 yy 2 2 da
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2 3 ww 2 2 da
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2 3 ya 2 2 da
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2 3 wa 2 2 da
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3 2 uuuw 3 3 i
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3 2 uuua 3 3 i
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3 3 zzzz 3 3 i
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3 3 zyxw 3 3 i
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3 3 zzza 3 3 i
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3 3 zyxa 3 3 i
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insert into t2 values
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(4,5,'a'), (7,8,'b'), (4,3,'c'), (1,2,'d'), (2,1,'e'), (5,5,'f'),
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(2,3,'g'), (7,7,'h'), (3,3,'i'), (3,2,'j'), (2,2,'k'), (5,5,'l'),
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(4,5,'aa'), (7,8,'bb'), (4,3,'cc'), (1,2,'dd'), (2,1,'ee'), (9,5,'ff'),
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(2,3,'gg'), (7,7,'hh'), (3,3,'ii'), (3,2,'jj'), (2,2,'kk'), (9,5,'ll'),
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(4,5,'aaa'), (7,8,'bbb'), (4,3,'ccc'), (1,2,'ddd'), (2,1,'eee'), (5,5,'fff'),
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(2,3,'ggg'), (7,7,'hhh'), (3,3,'iii'), (3,2,'jjj'), (2,2,'kkk'), (5,5,'lll'),
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(14,15,'a'), (17,18,'b'), (14,13,'c'), (11,12,'d'), (12,11,'e'), (15,15,'f'),
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(12,13,'g'), (17,17,'h'), (13,13,'i'), (13,12,'j'), (12,12,'k'), (15,15,'l'),
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(24,25,'a'), (27,28,'b'), (24,23,'c'), (21,22,'d'), (22,21,'e'), (25,25,'f'),
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(22,23,'g'), (27,27,'h'), (23,23,'i'), (23,22,'j'), (22,22,'k'), (25,25,'l'),
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(34,35,'a'), (37,38,'b'), (34,33,'c'), (31,32,'d'), (32,31,'e'), (35,35,'f'),
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(32,33,'g'), (37,37,'h'), (33,33,'i'), (33,32,'j'), (32,32,'k'), (35,35,'l'),
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(44,45,'a'), (47,48,'b'), (44,43,'c'), (41,42,'d'), (42,41,'e'), (45,45,'f'),
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(42,43,'g'), (47,47,'h'), (43,43,'i'), (43,42,'j'), (42,42,'k'), (45,45,'l');
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# join order: (t1,t2) with ref access of t2
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# range access to t1 by 1-component keys for index idx
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explain select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(8,8)) and length(f) = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 range idx idx 5 NULL 6 Using index condition
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1 SIMPLE t2 ref idx1,idx2 idx1 5 test.t1.a 12 Using where
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explain format=json select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(8,8)) and length(f) = 1;
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EXPLAIN
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{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "5",
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"used_key_parts": ["a"],
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"rows": 6,
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"filtered": 100,
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"index_condition": "t1.a is not null"
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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": ["idx1", "idx2"],
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"key": "idx1",
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"key_length": "5",
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"used_key_parts": ["d"],
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"ref": ["test.t1.a"],
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"rows": 12,
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"filtered": 100,
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"attached_condition": "(t1.a,t2.e) in (<cache>((3,3)),<cache>((7,7)),<cache>((8,8))) and length(t2.f) = 1"
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}
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}
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}
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select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(8,8)) and length(f) = 1;
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a b c d e f
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3 2 uuuw 3 3 i
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3 2 uuuw 3 3 i
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3 2 uuua 3 3 i
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3 2 uuua 3 3 i
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3 3 zzzz 3 3 i
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3 3 zzzz 3 3 i
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3 3 zyxw 3 3 i
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3 3 zyxw 3 3 i
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3 3 zzza 3 3 i
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3 3 zzza 3 3 i
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3 3 zyxa 3 3 i
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3 3 zyxa 3 3 i
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7 7 xxxyy 7 7 h
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7 7 xxxya 7 7 h
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7 8 xxxxx 7 7 h
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7 8 xxxxa 7 7 h
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prepare stmt from "select * from t1,t2
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where a = d and (a,e) in ((3,3),(7,7),(8,8)) and length(f) = 1";
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execute stmt;
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a b c d e f
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3 2 uuuw 3 3 i
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3 2 uuuw 3 3 i
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3 2 uuua 3 3 i
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3 2 uuua 3 3 i
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3 3 zzzz 3 3 i
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3 3 zzzz 3 3 i
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3 3 zyxw 3 3 i
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3 3 zyxw 3 3 i
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3 3 zzza 3 3 i
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3 3 zzza 3 3 i
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3 3 zyxa 3 3 i
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3 3 zyxa 3 3 i
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7 7 xxxyy 7 7 h
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7 7 xxxya 7 7 h
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7 8 xxxxx 7 7 h
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7 8 xxxxa 7 7 h
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execute stmt;
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a b c d e f
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3 2 uuuw 3 3 i
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3 2 uuuw 3 3 i
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3 2 uuua 3 3 i
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3 2 uuua 3 3 i
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3 3 zzzz 3 3 i
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3 3 zzzz 3 3 i
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3 3 zyxw 3 3 i
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3 3 zyxw 3 3 i
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3 3 zzza 3 3 i
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3 3 zzza 3 3 i
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3 3 zyxa 3 3 i
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3 3 zyxa 3 3 i
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7 7 xxxyy 7 7 h
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7 7 xxxya 7 7 h
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7 8 xxxxx 7 7 h
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7 8 xxxxa 7 7 h
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deallocate prepare stmt;
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insert into t1 select * from t1;
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# join order: (t2,t1) with ref access of t1
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# range access to t2 by keys for index idx2
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explain select * from t1,t2
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where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range idx1,idx2 idx2 5 NULL 6 Using where
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1 SIMPLE t1 ref idx idx 5 test.t2.d 11
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explain format=json select * from t1,t2
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where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
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EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
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"table": {
|
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"table_name": "t2",
|
||||
"access_type": "range",
|
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"possible_keys": ["idx1", "idx2"],
|
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"key": "idx2",
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"key_length": "5",
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"used_key_parts": ["e"],
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"rows": 6,
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"filtered": 100,
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"attached_condition": "(t2.d,t2.e) in (<cache>((4,4)),<cache>((7,7)),<cache>((8,8))) and length(t2.f) = 1 and t2.d is not null"
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},
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"table": {
|
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"table_name": "t1",
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"access_type": "ref",
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"possible_keys": ["idx"],
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"key": "idx",
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"key_length": "5",
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"used_key_parts": ["a"],
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"ref": ["test.t2.d"],
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"rows": 11,
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"filtered": 100
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}
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}
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}
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select * from t1,t2
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where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
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a b c d e f
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7 7 xxxyy 7 7 h
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7 7 xxxya 7 7 h
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7 7 xxxyy 7 7 h
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7 7 xxxya 7 7 h
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7 8 xxxxx 7 7 h
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7 8 xxxxa 7 7 h
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7 8 xxxxx 7 7 h
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7 8 xxxxa 7 7 h
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alter table t2 drop index idx1, drop index idx2, add index idx3(d,e);
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# join order: (t2,t1) with ref access of t1
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# range access to t2 by 2-component keys for index idx3
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explain select * from t1,t2
|
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where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range idx3 idx3 10 NULL 5 Using index condition; Using where
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||||
1 SIMPLE t1 ref idx idx 5 test.t2.d 11
|
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explain format=json select * from t1,t2
|
||||
where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
|
||||
EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
||||
"table": {
|
||||
"table_name": "t2",
|
||||
"access_type": "range",
|
||||
"possible_keys": ["idx3"],
|
||||
"key": "idx3",
|
||||
"key_length": "10",
|
||||
"used_key_parts": ["d", "e"],
|
||||
"rows": 5,
|
||||
"filtered": 100,
|
||||
"index_condition": "t2.d is not null",
|
||||
"attached_condition": "(t2.d,t2.e) in (<cache>((4,4)),<cache>((7,7)),<cache>((8,8))) and length(t2.f) = 1"
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t1",
|
||||
"access_type": "ref",
|
||||
"possible_keys": ["idx"],
|
||||
"key": "idx",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["a"],
|
||||
"ref": ["test.t2.d"],
|
||||
"rows": 11,
|
||||
"filtered": 100
|
||||
}
|
||||
}
|
||||
}
|
||||
select * from t1,t2
|
||||
where a = d and (a,e) in ((4,4),(7,7),(8,8)) and length(f) = 1;
|
||||
a b c d e f
|
||||
7 7 xxxyy 7 7 h
|
||||
7 7 xxxya 7 7 h
|
||||
7 7 xxxyy 7 7 h
|
||||
7 7 xxxya 7 7 h
|
||||
7 8 xxxxx 7 7 h
|
||||
7 8 xxxxa 7 7 h
|
||||
7 8 xxxxx 7 7 h
|
||||
7 8 xxxxa 7 7 h
|
||||
# join order: (t1,t2) with ref access of t2
|
||||
# range access to t1 by 1-component keys for index idx
|
||||
explain select * from t1,t2
|
||||
where a = d and (a,e) in ((4,d+1),(7,d+1),(8,d+1)) and length(f) = 1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 range idx idx 5 NULL 15 Using index condition
|
||||
1 SIMPLE t2 ref idx3 idx3 5 test.t1.a 3 Using where
|
||||
explain format=json select * from t1,t2
|
||||
where a = d and (a,e) in ((4,d+1),(7,d+1),(8,d+1)) and length(f) = 1;
|
||||
EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
||||
"table": {
|
||||
"table_name": "t1",
|
||||
"access_type": "range",
|
||||
"possible_keys": ["idx"],
|
||||
"key": "idx",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["a"],
|
||||
"rows": 15,
|
||||
"filtered": 100,
|
||||
"index_condition": "t1.a is not null"
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t2",
|
||||
"access_type": "ref",
|
||||
"possible_keys": ["idx3"],
|
||||
"key": "idx3",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["d"],
|
||||
"ref": ["test.t1.a"],
|
||||
"rows": 3,
|
||||
"filtered": 100,
|
||||
"attached_condition": "(t1.a,t2.e) in ((4,t1.a + 1),(7,t1.a + 1),(8,t1.a + 1)) and length(t2.f) = 1"
|
||||
}
|
||||
}
|
||||
}
|
||||
select * from t1,t2
|
||||
where a = d and (a,e) in ((4,d+1),(7,d+1),(8,d+1)) and length(f) = 1;
|
||||
a b c d e f
|
||||
4 3 zyx 4 5 a
|
||||
4 3 zya 4 5 a
|
||||
4 3 zyx 4 5 a
|
||||
4 3 zya 4 5 a
|
||||
4 5 ww 4 5 a
|
||||
4 5 wa 4 5 a
|
||||
4 5 ww 4 5 a
|
||||
4 5 wa 4 5 a
|
||||
7 7 xxxyy 7 8 b
|
||||
7 7 xxxya 7 8 b
|
||||
7 7 xxxyy 7 8 b
|
||||
7 7 xxxya 7 8 b
|
||||
7 8 xxxxx 7 8 b
|
||||
7 8 xxxxa 7 8 b
|
||||
7 8 xxxxx 7 8 b
|
||||
7 8 xxxxa 7 8 b
|
||||
# join order: (t1,t2) with ref access of t2
|
||||
# no range access
|
||||
explain select * from t1,t2
|
||||
where a = d and (a,e) in ((e,d+1),(7,7),(8,8)) and length(f) = 1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL idx NULL NULL NULL 144 Using where
|
||||
1 SIMPLE t2 ref idx3 idx3 5 test.t1.a 3 Using where
|
||||
explain format=json select * from t1,t2
|
||||
where a = d and (a,e) in ((e,d+1),(7,7),(8,8)) and length(f) = 1;
|
||||
EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
||||
"table": {
|
||||
"table_name": "t1",
|
||||
"access_type": "ALL",
|
||||
"possible_keys": ["idx"],
|
||||
"rows": 144,
|
||||
"filtered": 100,
|
||||
"attached_condition": "t1.a is not null"
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t2",
|
||||
"access_type": "ref",
|
||||
"possible_keys": ["idx3"],
|
||||
"key": "idx3",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["d"],
|
||||
"ref": ["test.t1.a"],
|
||||
"rows": 3,
|
||||
"filtered": 100,
|
||||
"attached_condition": "(t1.a,t2.e) in ((t2.e,t1.a + 1),<cache>((7,7)),<cache>((8,8))) and length(t2.f) = 1"
|
||||
}
|
||||
}
|
||||
}
|
||||
select * from t1,t2
|
||||
where a = d and (a,e) in ((e,d+1),(7,7),(8,8)) and length(f) = 1;
|
||||
a b c d e f
|
||||
7 8 xxxxx 7 7 h
|
||||
7 7 xxxyy 7 7 h
|
||||
7 8 xxxxa 7 7 h
|
||||
7 7 xxxya 7 7 h
|
||||
7 8 xxxxx 7 7 h
|
||||
7 7 xxxyy 7 7 h
|
||||
7 8 xxxxa 7 7 h
|
||||
7 7 xxxya 7 7 h
|
||||
# join order: (t1,t2) with ref access of t2
|
||||
# range access to t1 by 1-component keys for index idx
|
||||
explain select * from t1,t2
|
||||
where a = d and (a,2) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 range idx idx 5 NULL 13 Using index condition; Using where
|
||||
1 SIMPLE t2 ref idx3 idx3 5 test.t1.a 3 Using where
|
||||
explain format=json select * from t1,t2
|
||||
where a = d and (a,2) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
||||
"table": {
|
||||
"table_name": "t1",
|
||||
"access_type": "range",
|
||||
"possible_keys": ["idx"],
|
||||
"key": "idx",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["a"],
|
||||
"rows": 13,
|
||||
"filtered": 100,
|
||||
"index_condition": "t1.a is not null",
|
||||
"attached_condition": "(t1.a,2) in (<cache>((2,2)),<cache>((7,7)),<cache>((8,8))) and length(t1.c) = 1"
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t2",
|
||||
"access_type": "ref",
|
||||
"possible_keys": ["idx3"],
|
||||
"key": "idx3",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["d"],
|
||||
"ref": ["test.t1.a"],
|
||||
"rows": 3,
|
||||
"filtered": 100,
|
||||
"attached_condition": "length(t2.f) = 1"
|
||||
}
|
||||
}
|
||||
}
|
||||
select * from t1,t2
|
||||
where a = d and (a,2) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
a b c d e f
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
prepare stmt from "select * from t1,t2
|
||||
where a = d and (a,2) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1";
|
||||
execute stmt;
|
||||
a b c d e f
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
execute stmt;
|
||||
a b c d e f
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
2 1 w 2 1 e
|
||||
2 1 w 2 2 k
|
||||
2 1 w 2 3 g
|
||||
deallocate prepare stmt;
|
||||
create table t3 (id int primary key, v int) engine=myisam;
|
||||
insert into t3 values
|
||||
(3,2), (1,1), (4,12), (2,15);
|
||||
# join order: (t3,t1,t2) with const t3 and ref access of t2
|
||||
# range access to t1 by 1-component keys for index idx
|
||||
explain select * from t1,t2,t3
|
||||
where id = 1 and a = d and
|
||||
(a,v+1) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t3 const PRIMARY PRIMARY 4 const 1
|
||||
1 SIMPLE t1 range idx idx 5 NULL 13 Using index condition; Using where
|
||||
1 SIMPLE t2 ref idx3 idx3 5 test.t1.a 3 Using where
|
||||
explain format=json select * from t1,t2,t3
|
||||
where id = 1 and a = d and
|
||||
(a,v+1) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
EXPLAIN
|
||||
{
|
||||
"query_block": {
|
||||
"select_id": 1,
|
||||
"table": {
|
||||
"table_name": "t3",
|
||||
"access_type": "const",
|
||||
"possible_keys": ["PRIMARY"],
|
||||
"key": "PRIMARY",
|
||||
"key_length": "4",
|
||||
"used_key_parts": ["id"],
|
||||
"ref": ["const"],
|
||||
"rows": 1,
|
||||
"filtered": 100
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t1",
|
||||
"access_type": "range",
|
||||
"possible_keys": ["idx"],
|
||||
"key": "idx",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["a"],
|
||||
"rows": 13,
|
||||
"filtered": 100,
|
||||
"index_condition": "t1.a is not null",
|
||||
"attached_condition": "(t1.a,1 + 1) in (<cache>((2,2)),<cache>((7,7)),<cache>((8,8))) and length(t1.c) = 1"
|
||||
},
|
||||
"table": {
|
||||
"table_name": "t2",
|
||||
"access_type": "ref",
|
||||
"possible_keys": ["idx3"],
|
||||
"key": "idx3",
|
||||
"key_length": "5",
|
||||
"used_key_parts": ["d"],
|
||||
"ref": ["test.t1.a"],
|
||||
"rows": 3,
|
||||
"filtered": 100,
|
||||
"attached_condition": "length(t2.f) = 1"
|
||||
}
|
||||
}
|
||||
}
|
||||
select * from t1,t2,t3
|
||||
where id = 1 and a = d and
|
||||
(a,v+1) in ((2,2),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
a b c d e f id v
|
||||
2 1 w 2 1 e 1 1
|
||||
2 1 w 2 2 k 1 1
|
||||
2 1 w 2 3 g 1 1
|
||||
2 1 w 2 1 e 1 1
|
||||
2 1 w 2 2 k 1 1
|
||||
2 1 w 2 3 g 1 1
|
||||
# IN predicate is always FALSE
|
||||
explain select * from t1,t2,t3
|
||||
where id = 1 and a = d and
|
||||
(a,v+1) in ((9,9),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
|
||||
prepare stmt from "select * from t1,t2,t3
|
||||
where id = 1 and a = d and
|
||||
(a,v+1) in ((9,9),(7,7),(8,8)) and
|
||||
length(c) = 1 and length(f) = 1";
|
||||
execute stmt;
|
||||
a b c d e f id v
|
||||
execute stmt;
|
||||
a b c d e f id v
|
||||
deallocate prepare stmt;
|
||||
set optimizer_switch=@save_optimizer_switch;
|
||||
drop table t1,t2,t3;
|
||||
#
|
||||
# End of 10.2 tests
|
||||
#
|
||||
|
||||
Reference in New Issue
Block a user