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--echo #
--echo # Bug #24929748 REVERSE SCAN ON A PARTITIONED TABLE DOES ICP CHECK INCORRECTLY, CAUSING SLOWDOWN
--echo #
create table t1 (
date_col datetime not null,
col1 int,
filler varchar(255),
key(date_col, col1)
) engine=innodb
partition by range columns(date_col)
(
partition p0 values less than ('2015-01-01 00:00:00'),
partition p1 values less than ('2016-01-01 00:00:00'),
partition p2 values less than ('2017-01-01 00:00:00'),
partition p3 values less than (MAXVALUE)
);
create table t2(a int);
insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
insert into t1 select date_add('2014-01-01', interval (A.a+10*B.a) day),123456, repeat('raw-data', 5)
from t2 A, t2 B, t2 C;
insert into t1 select date_add('2015-01-01', interval (A.a+10*B.a) day), 123456,repeat('raw-data', 5)
from t2 A, t2 B, t2 C;
set @cnt=1;
select * from t1 force index(date_col) where
col1 + 10000000 > (@cnt:=@cnt+1) and date_col >= date('2014-04-01') AND date_col < date('2014-04-01' + interval 1 day)
ORDER BY date_col DESC;
select @cnt;
#Mutiple partittion scan
#delete some records in p1 ,then only it will go to QUICK_SELECT_DESC with ICP
delete from t1 where date_col>='2015-01-01' and date_col<='2016-01-06' limit 500;
#Range condition spans multiple partitions
set @cnt=1;
select * from t1 force index(date_col) where
col1 + 10000000 > (@cnt:=@cnt+1) and date_col >= date('2014-04-06') AND date_col < date('2015-02-10' + interval 1 day)
ORDER BY date_col DESC;
select @cnt;
drop table t1,t2;
#Multi range index read
create table t1 ( f1 int ,f2 int, key(f2)) engine=innodb
partition by range columns (f2)
(
partition p0 values less than (10000),
partition p1 values less than (20000),
partition p2 values less than (30000),
PARTITION p3 VALUES LESS THAN (MAXVALUE)
);
--disable_query_log
let $i=0;
set @cnt=1;
while ($i<20000)
{
insert into t1 values (123456,@cnt);
inc $i;
set @cnt = @cnt + 1;
}
--enable_query_log
select * from t1 where (f2>1000 and f2 <1002) or ( f2> 3000 and f2 < 3003) or (f2> 10001 and f2 < 10004) order by f2 desc;
drop table t1;