mirror of
https://github.com/MariaDB/server.git
synced 2025-01-27 17:33:44 +01:00
dddc20d9d1
Made a some new buffers thread specific and changeable. Resize of key_buffer. AUTO_COMMIT -> AUTOCOMMIT Fixed mutex bug in DROP DATABASE Fixed bug when using auto_increment as second part of a key where first part could include NULL. Split handler->extra() to extra() and extra_opt() to be able to support thread specific buffers. Don't write message to error log when slave reconnects becasue of timeout. Fixed possible update problem when using DELETE/UPDATE on small tables (In some cases we used index even if table scanning would be better) A lot of minior code cleanups
32 lines
1.2 KiB
Text
32 lines
1.2 KiB
Text
set @a := foo;
|
|
Unknown column 'foo' in 'field list'
|
|
set @a := connection_id() + 3;
|
|
select @a - connection_id();
|
|
@a - connection_id()
|
|
3
|
|
drop table if exists t1,t2;
|
|
CREATE TABLE t1 ( i int not null, v int not null,index (i));
|
|
insert into t1 values (1,1),(1,3),(2,1);
|
|
create table t2 (i int not null, unique (i));
|
|
insert into t2 select distinct i from t1;
|
|
select * from t2;
|
|
i
|
|
1
|
|
2
|
|
select distinct t2.i,@vv1:=if(sv1.i,1,0),@vv2:=if(sv2.i,1,0),@vv3:=if(sv3.i,1,0), @vv1+@vv2+@vv3 from t2 left join t1 as sv1 on sv1.i=t2.i and sv1.v=1 left join t1 as sv2 on sv2.i=t2.i and sv2.v=2 left join t1 as sv3 on sv3.i=t2.i and sv3.v=3;
|
|
i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
|
|
1 1 0 1 2
|
|
2 1 0 0 1
|
|
explain select * from t1 where i=@vv1;
|
|
table type possible_keys key key_len ref rows Extra
|
|
t1 ref i i 4 const 1 where used
|
|
explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
|
|
table type possible_keys key key_len ref rows Extra
|
|
t1 ALL NULL NULL NULL NULL 3 where used
|
|
explain select @vv1:=i from t1 where i=@vv1;
|
|
table type possible_keys key key_len ref rows Extra
|
|
t1 index NULL i 4 NULL 3 where used; Using index
|
|
explain select * from t1 where i=@vv1;
|
|
table type possible_keys key key_len ref rows Extra
|
|
t1 ref i i 4 const 1 where used
|
|
drop table t1,t2;
|