mariadb/mysql-test/main/user_var.result
Monty b66cdbd1ea Changing all cost calculation to be given in milliseconds
This makes it easier to compare different costs and also allows
the optimizer to optimizer different storage engines more reliably.

- Added tests/check_costs.pl, a tool to verify optimizer cost calculations.
  - Most engine costs has been found with this program. All steps to
    calculate the new costs are documented in Docs/optimizer_costs.txt

- User optimizer_cost variables are given in microseconds (as individual
  costs can be very small). Internally they are stored in ms.
- Changed DISK_READ_COST (was DISK_SEEK_BASE_COST) from a hard disk cost
  (9 ms) to common SSD cost (400MB/sec).
- Removed cost calculations for hard disks (rotation etc).
- Changed the following handler functions to return IO_AND_CPU_COST.
  This makes it easy to apply different cost modifiers in ha_..time()
  functions for io and cpu costs.
  - scan_time()
  - rnd_pos_time() & rnd_pos_call_time()
  - keyread_time()
- Enhanched keyread_time() to calculate the full cost of reading of a set
  of keys with a given number of ranges and optional number of blocks that
  need to be accessed.
- Removed read_time() as keyread_time() + rnd_pos_time() can do the same
  thing and more.
- Tuned cost for: heap, myisam, Aria, InnoDB, archive and MyRocks.
  Used heap table costs for json_table. The rest are using default engine
  costs.
- Added the following new optimizer variables:
  - optimizer_disk_read_ratio
  - optimizer_disk_read_cost
  - optimizer_key_lookup_cost
  - optimizer_row_lookup_cost
  - optimizer_row_next_find_cost
  - optimizer_scan_cost
- Moved all engine specific cost to OPTIMIZER_COSTS structure.
- Changed costs to use 'records_out' instead of 'records_read' when
  recalculating costs.
- Split optimizer_costs.h to optimizer_costs.h and optimizer_defaults.h.
  This allows one to change costs without having to compile a lot of
  files.
- Updated costs for filter lookup.
- Use a better cost estimate in best_extension_by_limited_search()
  for the sorting cost.
- Fixed previous issues with 'filtered' explain column as we are now
  using 'records_out' (min rows seen for table) to calculate filtering.
  This greatly simplifies the filtering code in
  JOIN_TAB::save_explain_data().

This change caused a lot of queries to be optimized differently than
before, which exposed different issues in the optimizer that needs to
be fixed.  These fixes are in the following commits.  To not have to
change the same test case over and over again, the changes in the test
cases are done in a single commit after all the critical change sets
are done.

InnoDB changes:
- Updated InnoDB to not divide big range cost with 2.
- Added cost for InnoDB (innobase_update_optimizer_costs()).
- Don't mark clustered primary key with HA_KEYREAD_ONLY. This will
  prevent that the optimizer is trying to use index-only scans on
  the clustered key.
- Disabled ha_innobase::scan_time() and ha_innobase::read_time() and
  ha_innobase::rnd_pos_time() as the default engine cost functions now
  works good for InnoDB.

Other things:
- Added  --show-query-costs (\Q) option to mysql.cc to show the query
  cost after each query (good when working with query costs).
- Extended my_getopt with GET_ADJUSTED_VALUE which allows one to adjust
  the value that user is given. This is used to change cost from
  microseconds (user input) to milliseconds (what the server is
  internally using).
- Added include/my_tracker.h  ; Useful include file to quickly test
  costs of a function.
- Use handler::set_table() in all places instead of 'table= arg'.
- Added SHOW_OPTIMIZER_COSTS to sys variables. These are input and
  shown in microseconds for the user but stored as milliseconds.
  This is to make the numbers easier to read for the user (less
  pre-zeros).  Implemented in 'Sys_var_optimizer_cost' class.
- In test_quick_select() do not use index scans if 'no_keyread' is set
  for the table. This is what we do in other places of the server.
- Added THD parameter to Unique::get_use_cost() and
  check_index_intersect_extension() and similar functions to be able
  to provide costs to called functions.
- Changed 'records' to 'rows' in optimizer_trace.
- Write more information to optimizer_trace.
- Added INDEX_BLOCK_FILL_FACTOR_MUL (4) and INDEX_BLOCK_FILL_FACTOR_DIV (3)
  to calculate usage space of keys in b-trees. (Before we used numeric
  constants).
- Removed code that assumed that b-trees has similar costs as binary
  trees. Replaced with engine calls that returns the cost.
- Added Bitmap::find_first_bit()
- Added timings to join_cache for ANALYZE table (patch by Sergei Petrunia).
- Added records_init and records_after_filter to POSITION to remember
  more of what best_access_patch() calculates.
- table_after_join_selectivity() changed to recalculate 'records_out'
  based on the new fields from best_access_patch()

Bug fixes:
- Some queries did not update last_query_cost (was 0). Fixed by moving
  setting thd->...last_query_cost in JOIN::optimize().
- Write '0' as number of rows for const tables with a matching row.

Some internals:
- Engine cost are stored in OPTIMIZER_COSTS structure.  When a
  handlerton is created, we also created a new cost variable for the
  handlerton. We also create a new variable if the user changes a
  optimizer cost for a not yet loaded handlerton either with command
  line arguments or with SET
  @@global.engine.optimizer_cost_variable=xx.
- There are 3 global OPTIMIZER_COSTS variables:
  default_optimizer_costs   The default costs + changes from the
                            command line without an engine specifier.
  heap_optimizer_costs      Heap table costs, used for temporary tables
  tmp_table_optimizer_costs The cost for the default on disk internal
                            temporary table (MyISAM or Aria)
- The engine cost for a table is stored in table_share. To speed up
  accesses the handler has a pointer to this. The cost is copied
  to the table on first access. If one wants to change the cost one
  must first update the global engine cost and then do a FLUSH TABLES.
  This was done to be able to access the costs for an open table
  without any locks.
- When a handlerton is created, the cost are updated the following way:
  See sql/keycaches.cc for details:
  - Use 'default_optimizer_costs' as a base
  - Call hton->update_optimizer_costs() to override with the engines
    default costs.
  - Override the costs that the user has specified for the engine.
  - One handler open, copy the engine cost from handlerton to TABLE_SHARE.
  - Call handler::update_optimizer_costs() to allow the engine to update
    cost for this particular table.
  - There are two costs stored in THD. These are copied to the handler
    when the table is used in a query:
    - optimizer_where_cost
    - optimizer_scan_setup_cost
- Simply code in best_access_path() by storing all cost result in a
  structure. (Idea/Suggestion by Igor)
2023-02-02 23:54:45 +03:00

598 lines
15 KiB
Text

set @a := foo;
ERROR 42S22: Unknown column 'foo' in 'field list'
set @a := connection_id() + 3;
select @a - connection_id();
@a - connection_id()
3
set @b := 1;
select @b;
@b
1
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;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref i i 4 const 2
select @vv1,i,v from t1 where i=@vv1;
@vv1 i v
1 1 1
1 1 3
explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
explain select @vv1:=i from t1 where i=@vv1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL i 4 NULL 3 Using where; Using index
explain select * from t1 where i=@vv1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref i i 4 const 2
drop table t1,t2;
set @a=0,@b=0;
select @a:=10, @b:=1, @a > @b, @a < @b;
@a:=10 @b:=1 @a > @b @a < @b
10 1 1 0
select @a:="10", @b:="1", @a > @b, @a < @b;
@a:="10" @b:="1" @a > @b @a < @b
10 1 1 0
select @a:=10, @b:=2, @a > @b, @a < @b;
@a:=10 @b:=2 @a > @b @a < @b
10 2 0 1
select @a:="10", @b:="2", @a > @b, @a < @b;
@a:="10" @b:="2" @a > @b @a < @b
10 2 1 0
select @a:=1;
@a:=1
1
select @a, @a:=1;
@a @a:=1
1 1
create table t1 (id int, d double, c char(10));
insert into t1 values (1,2.0, "test");
select @c:=0;
@c:=0
0
update t1 SET id=(@c:=@c+1);
select @c;
@c
1
select @c:=0;
@c:=0
0
update t1 set id=(@c:=@c+1);
select @c;
@c
1
select @c:=0;
@c:=0
0
select @c:=@c+1;
@c:=@c+1
1
select @d,(@d:=id),@d from t1;
@d (@d:=id) @d
NULL 1 1
select @e,(@e:=d),@e from t1;
@e (@e:=d) @e
NULL 2 2
select @f,(@f:=c),@f from t1;
@f (@f:=c) @f
NULL test test
set @g=1;
select @g,(@g:=c),@g from t1;
@g (@g:=c) @g
1 test 0
select @c, @d, @e, @f;
@c @d @e @f
1 1 2 test
select @d:=id, @e:=id, @f:=id, @g:=@id from t1;
@d:=id @e:=id @f:=id @g:=@id
1 1 1 NULL
select @c, @d, @e, @f, @g;
@c @d @e @f @g
1 1 1 1 NULL
drop table t1;
select @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b, @a:=10, @b:=2, @a>@b, @a:="10", @b:="2", @a>@b;
@a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b @a:=10 @b:=2 @a>@b @a:="10" @b:="2" @a>@b
10 2 1 10 2 1 10 2 1 10 2 1
create table t1 (i int not null);
insert t1 values (1),(2),(2),(3),(3),(3);
select @a:=0;
@a:=0
0
select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
@a @a:=@a+count(*) count(*) @a
0 1 1 0
0 2 2 0
0 3 3 0
select @a:=0;
@a:=0
0
select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
@a+0 @a:=@a+0+count(*) count(*) @a+0
0 1 1 0
0 2 2 0
0 3 3 0
set @a=0;
select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
@a @a:="hello" @a @a:=3 @a @a:="hello again"
0 hello 0 3 0 hello again
0 hello 0 3 0 hello again
0 hello 0 3 0 hello again
select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
@a @a:="hello" @a @a:=3 @a @a:="hello again"
hello again hello hello again 3 hello again hello again
hello again hello hello again 3 hello again hello again
hello again hello hello again 3 hello again hello again
drop table t1;
set @a=_latin2'test';
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 2
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
select @a=_latin2'TEST' collate latin2_bin;
@a=_latin2'TEST' collate latin2_bin
0
set @a=_latin2'test' collate latin2_general_ci;
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 2
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
select @a=_latin2'TEST' collate latin2_bin;
@a=_latin2'TEST' collate latin2_bin
0
select charset(@a:=_latin2'test');
charset(@a:=_latin2'test')
latin2
select collation(@a:=_latin2'test');
collation(@a:=_latin2'test')
latin2_general_ci
select coercibility(@a:=_latin2'test');
coercibility(@a:=_latin2'test')
2
select collation(@a:=_latin2'test' collate latin2_bin);
collation(@a:=_latin2'test' collate latin2_bin)
latin2_bin
select coercibility(@a:=_latin2'test' collate latin2_bin);
coercibility(@a:=_latin2'test' collate latin2_bin)
2
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
0
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_bin 2
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
1
set @var= NULL ;
select FIELD( @var,'1it','Hit') as my_column;
my_column
0
select @v, coercibility(@v);
@v coercibility(@v)
NULL 2
set @v1=null, @v2=1, @v3=1.1, @v4=now();
select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4)
2 5 5 2
set session @honk=99;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@honk=99' at line 1
select @@local.max_allowed_packet;
@@local.max_allowed_packet
#
select @@session.max_allowed_packet;
@@session.max_allowed_packet
#
select @@global.max_allowed_packet;
@@global.max_allowed_packet
#
select @@max_allowed_packet;
@@max_allowed_packet
#
select @@Max_Allowed_Packet;
@@Max_Allowed_Packet
#
select @@version;
@@version
#
select @@global.version;
@@global.version
#
End of 4.1 tests
set @first_var= NULL;
create table t1 select @first_var;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`@first_var` longblob DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set @first_var= cast(NULL as signed integer);
create table t1 select @first_var;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`@first_var` bigint(20) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set @first_var= NULL;
create table t1 select @first_var;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`@first_var` bigint(20) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set @first_var= concat(NULL);
create table t1 select @first_var;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`@first_var` longblob DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set @first_var=1;
set @first_var= cast(NULL as CHAR);
create table t1 select @first_var;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`@first_var` longtext DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
drop table t1;
set @a=18446744071710965857;
select @a;
@a
18446744071710965857
CREATE TABLE `bigfailure` (
`afield` BIGINT UNSIGNED NOT NULL
);
INSERT INTO `bigfailure` VALUES (18446744071710965857);
SELECT * FROM bigfailure;
afield
18446744071710965857
select * from (SELECT afield FROM bigfailure) as b;
afield
18446744071710965857
select * from bigfailure where afield = (SELECT afield FROM bigfailure);
afield
18446744071710965857
select * from bigfailure where afield = 18446744071710965857;
afield
18446744071710965857
select * from bigfailure where afield = 18446744071710965856+1;
afield
18446744071710965857
SET @a := (SELECT afield FROM bigfailure);
SELECT @a;
@a
18446744071710965857
SET @a := (select afield from (SELECT afield FROM bigfailure) as b);
SELECT @a;
@a
18446744071710965857
SET @a := (select * from bigfailure where afield = (SELECT afield FROM bigfailure));
SELECT @a;
@a
18446744071710965857
drop table bigfailure;
create table t1(f1 int, f2 int);
insert into t1 values (1,2),(2,3),(3,1);
select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
@var:=f2
3
select @var;
@var
3
create table t2 as select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
select * from t2;
@var:=f2
3
select @var;
@var
3
drop table t1,t2;
insert into city 'blah';
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ''blah'' at line 1
SHOW COUNT(*) WARNINGS;
@@session.warning_count
1
SHOW COUNT(*) ERRORS;
@@session.error_count
1
create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
insert into t1 values
(1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
(3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
(3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
select @a:=f1, count(f1) from t1 group by 1 desc;
@a:=f1 count(f1)
4 1
3 2
2 1
1 4
select @a:=f1, count(f1) from t1 group by 1 asc;
@a:=f1 count(f1)
1 4
2 1
3 2
4 1
select @a:=f2, count(f2) from t1 group by 1 desc;
@a:=f2 count(f2)
d 1
c 2
b 1
a 4
select @a:=f3, count(f3) from t1 group by 1 desc;
@a:=f3 count(f3)
4.5 1
3.5 2
2.5 1
1.5 4
select @a:=f4, count(f4) from t1 group by 1 desc;
@a:=f4 count(f4)
4.6 1
3.6 2
2.6 1
1.6 4
drop table t1;
create table t1 (f1 int);
insert into t1 values (2), (1);
select @i := f1 as j from t1 order by 1;
j
1
2
drop table t1;
create table t1(a int);
insert into t1 values(5),(4),(4),(3),(2),(2),(2),(1);
set @rownum := 0;
set @rank := 0;
set @prev_score := NULL;
select @rownum := @rownum + 1 as row,
@rank := IF(@prev_score!=a, @rownum, @rank) as rank,
@prev_score := a as score
from t1 order by score desc;
drop table t1;
create table t1(b bigint);
insert into t1 (b) values (10), (30), (10), (10);
set @var := 0;
explain select if(b=@var, 999, b) , @var := b from t1 order by b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4 Using filesort
set @var := 0;
select if(b=@var, 999, b) , @var := b from t1 order by b;
if(b=@var, 999, b) @var := b
10 10
30 30
999 10
999 10
drop table t1;
create temporary table t1 (id int);
insert into t1 values (2), (3), (3), (4);
set @lastid=-1;
select @lastid != id, @lastid, @lastid := id from t1;
@lastid != id @lastid @lastid := id
1 -1 2
1 2 3
0 3 3
1 3 4
drop table t1;
create temporary table t1 (id bigint);
insert into t1 values (2), (3), (3), (4);
set @lastid=-1;
select @lastid != id, @lastid, @lastid := id from t1;
@lastid != id @lastid @lastid := id
1 -1 2
1 2 3
0 3 3
1 3 4
drop table t1;
CREATE TABLE t1(a INT, b INT);
INSERT INTO t1 VALUES (0, 0), (2, 1), (2, 3), (1, 1), (30, 20);
SELECT a, b INTO @a, @b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
SELECT @a, @b;
@a @b
2 3
SELECT a, b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
a b
2 3
DROP TABLE t1;
CREATE TABLE t1 (f1 int(11) default NULL, f2 int(11) default NULL);
CREATE TABLE t2 (f1 int(11) default NULL, f2 int(11) default NULL, foo int(11));
CREATE TABLE t3 (f1 int(11) default NULL, f2 int(11) default NULL);
INSERT INTO t1 VALUES(10, 10);
INSERT INTO t1 VALUES(10, 10);
INSERT INTO t2 VALUES(10, 10, 10);
INSERT INTO t2 VALUES(10, 10, 10);
INSERT INTO t3 VALUES(10, 10);
INSERT INTO t3 VALUES(10, 10);
SELECT MIN(t2.f1),
@bar:= (SELECT MIN(t3.f2) FROM t3 WHERE t3.f2 > foo)
FROM t1,t2 WHERE t1.f1 = t2.f1 ORDER BY t2.f1;
MIN(t2.f1) @bar:= (SELECT MIN(t3.f2) FROM t3 WHERE t3.f2 > foo)
10 NULL
DROP TABLE t1, t2, t3;
End of 5.0 tests
CREATE TABLE t1 (i INT);
CREATE TRIGGER t_after_insert AFTER INSERT ON t1 FOR EACH ROW SET @bug42188 = 10;
INSERT INTO t1 VALUES (1);
INSERT INTO t1 VALUES (1);
DROP TABLE t1;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(0);
# BUG#55615 : should not crash
SELECT (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) FROM t1 GROUP BY @a;
(@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1)
1
1
# BUG#55564 : should not crash
SELECT IF(
@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
count(*), 1)
FROM t1 GROUP BY a LIMIT 1;
IF(
@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
count(*), 1)
1
DROP TABLE t1;
select @v:=@v:=sum(1) from dual;
@v:=@v:=sum(1)
1
CREATE TABLE t1(a DECIMAL(31,21));
INSERT INTO t1 VALUES (0);
SELECT (@v:=a) <> (@v:=1) FROM t1;
(@v:=a) <> (@v:=1)
1
DROP TABLE t1;
CREATE TABLE t1(a int);
INSERT INTO t1 VALUES (1), (2);
SELECT DISTINCT @a:=MIN(t1.a) FROM t1, t1 AS t2
GROUP BY @b:=(SELECT COUNT(*) > t2.a);
@a:=MIN(t1.a)
1
DROP TABLE t1;
SET @bug12408412=1;
SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412;
End of 5.1 tests
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0);
SELECT DISTINCT POW(COUNT(*), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a))
AS b FROM t1 GROUP BY a;
b
1
SELECT @a;
@a
1
DROP TABLE t1;
CREATE TABLE t1(f1 INT, f2 INT);
INSERT INTO t1 VALUES (1,2),(2,3),(3,1);
CREATE TABLE t2(a INT);
INSERT INTO t2 VALUES (1);
SET @var=NULL;
SELECT @var:=(SELECT f2 FROM t2 WHERE @var) FROM t1 GROUP BY f1 ORDER BY f2 DESC
LIMIT 1;
@var:=(SELECT f2 FROM t2 WHERE @var)
NULL
SELECT @var;
@var
NULL
DROP TABLE t1, t2;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(1),(3);
SELECT DISTINCT POW(COUNT(distinct a), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a limit 1)) AS b FROM t1 GROUP BY a;
b
1
SELECT @a;
@a
1
DROP TABLE t1;
End of 5.2 tests
CREATE TABLE t1(f1 INT AUTO_INCREMENT, PRIMARY KEY(f1));
INSERT INTO t1 SET f1 = NULL ;
SET @aux = NULL ;
INSERT INTO t1 SET f1 = @aux ;
SET @aux1 = 0.123E-1;
SET @aux1 = NULL;
INSERT INTO t1 SET f1 = @aux1 ;
SELECT * FROM t1;
f1
1
2
3
DROP TABLE t1;
CREATE TABLE t1(f1 VARCHAR(257) , f2 INT, PRIMARY KEY(f2));
CREATE TRIGGER trg1 BEFORE INSERT ON t1 FOR EACH ROW SET @aux = 1;
SET @aux = 1;
SET @aux = NULL;
INSERT INTO test.t1 (f1, f2) VALUES (1, 1), (@aux, 2);
SET @aux = 'text';
SET @aux = NULL;
INSERT INTO t1(f1, f2) VALUES (1, 3), (@aux, 4);
SELECT f1, f2 FROM t1 ORDER BY f2;
f1 f2
1 1
1 2
1 3
1 4
DROP TRIGGER trg1;
DROP TABLE t1;
#
# Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT
# SAME USER VARIABLE = CRASH
#
SET @bug12408412=1;
SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0);
SELECT DISTINCT POW(COUNT(*), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a))
AS b FROM t1 GROUP BY a;
b
1
SELECT @a;
@a
1
DROP TABLE t1;
CREATE TABLE t1(f1 INT, f2 INT);
INSERT INTO t1 VALUES (1,2),(2,3),(3,1);
CREATE TABLE t2(a INT);
INSERT INTO t2 VALUES (1);
SET @var=NULL;
SELECT @var:=(SELECT f2 FROM t2 WHERE @var) FROM t1 GROUP BY f1 ORDER BY f2 DESC
LIMIT 1;
@var:=(SELECT f2 FROM t2 WHERE @var)
NULL
SELECT @var;
@var
NULL
DROP TABLE t1, t2;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES (0),(1),(3);
SELECT DISTINCT POW(COUNT(distinct a), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a limit 1)) AS b FROM t1 GROUP BY a;
b
1
SELECT @a;
@a
1
DROP TABLE t1;
End of 5.5 tests
#
# Check that used memory extends if we set a variable
#
set @var= repeat('a',20000);
1
explain select @a:=max(seq) from seq_1_to_1000000;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
#
# Start of 10.3 tests
#
#
# MDEV-12859 Out-of-range error for CREATE..SELECT @a:=EXTRACT(MINUTE_MICROSECOND FROM..
#
SET sql_mode=STRICT_ALL_TABLES;
CREATE OR REPLACE TABLE t1 AS
SELECT @a:=EXTRACT(MINUTE_MICROSECOND FROM '2001-01-01 11:22:33.999999') AS c1;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` bigint(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SELECT * FROM t1;
c1
2233999999
DROP TABLE t1;
SET sql_mode=DEFAULT;