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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
@@ -1857,3 +1857,195 @@ DROP TABLE t1;
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--echo #
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--echo # End of 10.1 tests
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--echo #
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--echo #
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--echo # MDEV-10454: range access keys extracted
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--echo # from <row> IN (<row value list>)
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--echo #
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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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--echo # range access to t1 by 2-component keys for index idx
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let $q1=
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select * from t1 where (a,b) IN ((2, 3),(3,3),(8,8),(7,7));
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eval explain $q1;
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eval explain format=json $q1;
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eval $q1;
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eval prepare stmt from "$q1";
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execute stmt;
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execute stmt;
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deallocate prepare stmt;
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--echo # range access to t1 by 1-component keys for index idx
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let $q2=
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select * from t1 where (a,b+a) IN ((4,9),(8,8),(7,7));
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eval explain $q2;
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eval explain format=json $q2;
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eval $q2;
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--echo # range access to t1 by 1-component keys for index idx
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let $q3=
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select * from t1 where (a,b) IN ((4,a-1),(8,a+8),(7,a+7));
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eval explain $q3;
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eval explain format=json $q3;
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eval $q3;
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# this setting should be removed after fixes for mdev-12186, mdev-12187
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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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--echo # join order: (t2,t1) with ref access of t1
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--echo # range access to t1 by keys for index idx1
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let $q4=
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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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eval explain $q4;
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eval explain format=json $q4;
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eval $q4;
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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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--echo # join order: (t1,t2) with ref access of t2
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--echo # range access to t1 by 1-component keys for index idx
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let $q5=
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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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eval explain $q5;
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eval explain format=json $q5;
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eval $q5;
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eval prepare stmt from "$q5";
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execute stmt;
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execute stmt;
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deallocate prepare stmt;
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insert into t1 select * from t1;
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--echo # join order: (t2,t1) with ref access of t1
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--echo # range access to t2 by keys for index idx2
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let $q6=
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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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eval explain $q6;
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eval explain format=json $q6;
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eval $q6;
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alter table t2 drop index idx1, drop index idx2, add index idx3(d,e);
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--echo # join order: (t2,t1) with ref access of t1
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--echo # range access to t2 by 2-component keys for index idx3
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let $q7=
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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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eval explain $q7;
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eval explain format=json $q7;
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eval $q7;
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--echo # join order: (t1,t2) with ref access of t2
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--echo # range access to t1 by 1-component keys for index idx
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let $q8=
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select * from t1,t2
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where a = d and (a,e) in ((4,d+1),(7,d+1),(8,d+1)) and length(f) = 1;
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eval explain $q8;
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eval explain format=json $q8;
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eval $q8;
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--echo # join order: (t1,t2) with ref access of t2
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--echo # no range access
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let $q9=
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select * from t1,t2
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where a = d and (a,e) in ((e,d+1),(7,7),(8,8)) and length(f) = 1;
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eval explain $q9;
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eval explain format=json $q9;
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eval $q9;
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--echo # join order: (t1,t2) with ref access of t2
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--echo # range access to t1 by 1-component keys for index idx
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let $q10=
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select * from t1,t2
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where a = d and (a,2) in ((2,2),(7,7),(8,8)) and
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length(c) = 1 and length(f) = 1;
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eval explain $q10;
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eval explain format=json $q10;
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eval $q10;
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eval prepare stmt from "$q10";
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execute stmt;
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execute stmt;
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deallocate prepare stmt;
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create table t3 (id int primary key, v int) engine=myisam;
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insert into t3 values
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(3,2), (1,1), (4,12), (2,15);
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--echo # join order: (t3,t1,t2) with const t3 and ref access of t2
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--echo # range access to t1 by 1-component keys for index idx
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let $q11=
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select * from t1,t2,t3
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where id = 1 and a = d and
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(a,v+1) in ((2,2),(7,7),(8,8)) and
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length(c) = 1 and length(f) = 1;
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eval explain $q11;
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eval explain format=json $q11;
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eval $q11;
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--echo # IN predicate is always FALSE
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let $q12=
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select * from t1,t2,t3
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where id = 1 and a = d and
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(a,v+1) in ((9,9),(7,7),(8,8)) and
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length(c) = 1 and length(f) = 1;
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eval explain $q12;
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eval prepare stmt from "$q12";
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execute stmt;
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execute stmt;
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deallocate prepare stmt;
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set optimizer_switch=@save_optimizer_switch;
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drop table t1,t2,t3;
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--echo #
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--echo # End of 10.2 tests
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--echo #
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