mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 12:02:42 +01:00
9f71804110
Partitioning storage now supports MRR but doesn't support Index Condition Pushdown (aka ICP). This causes counter-intuitive query plans for queries that use BKA and conditions that depend on index fields: - If the condition refers to other tables, BKA's variant of ICP is used to handle it. - If the condition depends on this table only, the optimizer will try to use regular ICP for it, which will fail because the storage engine doesn't support ICP. Make the optimizer be smarter in the second case: if we were not able to use regular ICP, use BKA's variant of ICP..
62 lines
2 KiB
Text
62 lines
2 KiB
Text
let $engine_type= myisam;
|
|
|
|
--source include/partition_mrr.inc
|
|
|
|
--echo #
|
|
--echo # MDEV-21628: Index condition pushdown for a simple condition over
|
|
--echo # index fields is not used for ref access of partitioned tables when employing BKA
|
|
--echo #
|
|
|
|
create table t0 (
|
|
tp int, a int, b int, c varchar(12), index idx (a,b)
|
|
);
|
|
|
|
insert into t0 values
|
|
(1,3,30,'yyzy'), (1,3,30,'yxxyy'), (1,3,30,'yyxy'), (1,3,30,'xxyy'),
|
|
(1,3,30,'yyxz'), (1,3,30,'yyzz'), (1,3,30,'xxyzy'), (1,3,30,'yyyy'),
|
|
(1,3,30,'yzzy'), (1,93,30,'zzzy'),
|
|
(2,3,40,'yxx'), (2,4,40,'xx'), (2,3,10,'zxz'),
|
|
(2,3,40,'yyx'), (2,4,40,'xxx'), (2,3,10,'zyyz'),
|
|
(2,3,40,'xzzzz'), (2,4,40,'yyyxx'), (2,3,10,'zyz'),
|
|
(2,3,40,'xxx'), (2,4,40,'xx'), (2,3,10,'zzz'),
|
|
(2,3,40,'yyxzx'), (2,4,40,'xyx'), (2,3,10,'xzz'),
|
|
(2,3,40,'xxxzz'), (2,4,40,'xxz'), (2,3,10,'zzzy'),
|
|
(2,3,40,'zzxxx'), (2,4,40,'zxx'), (2,3,10,'yzzz'),
|
|
(2,3,40,'xyyxx'), (2,4,40,'xzzzx'), (2,3,10,'zzxxz'),
|
|
(2,3,40,'yzxxx'), (2,4,40,'xxzy'), (2,3,10,'zzzyx'),
|
|
(2,93,40,'xzx'), (2,94,40,'xz'), (2,93,10,'zyyyz'),
|
|
(3,4,30,'yx'), (3,4,30,'yyxxx'), (3,4,30,'zzyy'), (3,4,30,'zxyy'),
|
|
(3,4,30,'xxyy'), (3,4,30,'yyzx'), (3,4,30,'zyyy'), (3,4,30,'yzy'),
|
|
(3,4,30,'zzzyy'), (3,94,30,'yyz');
|
|
|
|
create table t1 (
|
|
tp int, a int, b int, c varchar(12), index idx (a,b)
|
|
) engine=myisam
|
|
partition by list (tp)
|
|
( partition p1 values in (1),
|
|
partition p2 values in (2),
|
|
partition p3 values in (3));
|
|
insert into t1 select * from t0;
|
|
|
|
create table t2 (a int, index idx(a)) engine=myisam;
|
|
insert into t2 values (1), (2), (3), (4), (5);
|
|
insert into t2 select a+10 from t2;
|
|
insert into t2 select a+20 from t2;
|
|
|
|
analyze table t0,t1,t2;
|
|
|
|
set @tmp1=@@join_cache_level, @tmp2=@@optimizer_switch;
|
|
set join_cache_level=6, optimizer_switch='mrr=on';
|
|
|
|
explain
|
|
select * from t0,t2 where t2.a in (3,4) and t0.a=t2.a and (t0.b / 10) = 4;
|
|
|
|
--echo # This will use "Using index condition(BKA)"
|
|
explain
|
|
select * from t1,t2 where t2.a in (3,4) and t1.a=t2.a and (t1.b / 10) = 4;
|
|
|
|
set join_cache_level=@tmp1, optimizer_switch=@tmp2;
|
|
|
|
drop table t0,t1,t2;
|
|
|
|
|