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be093c81a7
The ROWNUM() function is for SELECT mapped to JOIN->accepted_rows, which is
incremented for each accepted rows.
For Filesort, update, insert, delete and load data, we map ROWNUM() to
internal variables incremented when the table is changed.
The connection between the row counter and Item_func_rownum is done
in sql_select.cc::fix_items_after_optimize() and
sql_insert.cc::fix_rownum_pointers()
When ROWNUM() is used anywhere in query, the optimization to ignore ORDER
BY in sub queries are disabled. This was done to get the following common
Oracle query to work:
select * from (select * from t1 order by a desc) as t where rownum() <= 2;
MDEV-3926 "Wrong result with GROUP BY ... WITH ROLLUP" contains a discussion
about this topic.
LIMIT optimization is enabled when in a top level WHERE clause comparing
ROWNUM() with a numerical constant using any of the following expressions:
- ROWNUM() < #
- ROWNUM() <= #
- ROWNUM() = 1
ROWNUM() can be also be the right argument to the comparison function.
LIMIT optimization is done in two cases:
- For the current sub query when the ROWNUM comparison is done on the top
level:
SELECT * from t1 WHERE rownum() <= 2 AND t1.a > 0
- For an inner sub query, when the upper level has only a ROWNUM comparison
in the WHERE clause:
SELECT * from (select * from t1) as t WHERE rownum() <= 2
In Oracle mode, one can also use ROWNUM without parentheses.
Other things:
- Fixed bug where the optimizer tries to optimize away sub queries
with RAND_TABLE_BIT set (non-deterministic queries). Now these
sub queries will not be converted to joins. This bug fix was also
needed to get rownum() working inside subqueries.
- In remove_const() remove setting simple_order to FALSE if ROLLUP is
USED. This code was disable a long time ago because of wrong assignment
in the following code. Instead we set simple_order to false if
RAND_TABLE_BIT was used in the SELECT list. This ensures that
we don't delete ORDER BY if the result set is not deterministic, like
in 'SELECT RAND() AS 'r' FROM t1 ORDER BY r';
- Updated parameters for Sort_param::init_for_filesort() to be able
to provide filesort with information where the number of accepted
rows should be stored
- Reordered fields in class Filesort to optimize storage layout
- Added new error messsage to tell that a function can't be used in HAVING
- Added field 'with_rownum' to THD to mark that ROWNUM() is used in the
query.
Co-author: Oleksandr Byelkin <sanja@mariadb.com>
LIMIT optimization for sub query
526 lines
14 KiB
Text
526 lines
14 KiB
Text
# Initialise
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source include/have_sequence.inc;
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--error 1054
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set @a := foo;
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set @a := connection_id() + 3;
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select @a - connection_id();
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set @b := 1;
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select @b;
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# Check using and setting variables with SELECT DISTINCT
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CREATE TABLE t1 ( i int not null, v int not null,index (i));
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insert into t1 values (1,1),(1,3),(2,1);
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create table t2 (i int not null, unique (i));
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insert into t2 select distinct i from t1;
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select * from t2;
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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;
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explain select * from t1 where i=@vv1;
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select @vv1,i,v from t1 where i=@vv1;
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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explain select @vv1:=i from t1 where i=@vv1;
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explain select * from t1 where i=@vv1;
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drop table t1,t2;
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# Check types of variables
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set @a=0,@b=0;
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select @a:=10, @b:=1, @a > @b, @a < @b;
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# Note that here a and b will be avaluated as number
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select @a:="10", @b:="1", @a > @b, @a < @b;
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# Note that here a and b will be avaluated as strings
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select @a:=10, @b:=2, @a > @b, @a < @b;
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select @a:="10", @b:="2", @a > @b, @a < @b;
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# Fixed bug #1194
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select @a:=1;
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select @a, @a:=1;
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create table t1 (id int, d double, c char(10));
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insert into t1 values (1,2.0, "test");
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select @c:=0;
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update t1 SET id=(@c:=@c+1);
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select @c;
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select @c:=0;
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update t1 set id=(@c:=@c+1);
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select @c;
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select @c:=0;
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select @c:=@c+1;
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select @d,(@d:=id),@d from t1;
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select @e,(@e:=d),@e from t1;
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select @f,(@f:=c),@f from t1;
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set @g=1;
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select @g,(@g:=c),@g from t1;
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select @c, @d, @e, @f;
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select @d:=id, @e:=id, @f:=id, @g:=@id from t1;
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select @c, @d, @e, @f, @g;
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drop table t1;
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# just for fun :)
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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;
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#
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# bug#1739
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# Item_func_set_user_var sets update_query_id, Item_func_get_user_var checks it
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#
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create table t1 (i int not null);
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insert t1 values (1),(2),(2),(3),(3),(3);
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select @a:=0; select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
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select @a:=0; select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
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set @a=0;
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select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
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select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
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drop table t1;
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#
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# Bug #2244: User variables didn't copy collation and derivation
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# attributes from values they were initialized to.
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#
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set @a=_latin2'test';
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select charset(@a),collation(@a),coercibility(@a);
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select @a=_latin2'TEST';
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select @a=_latin2'TEST' collate latin2_bin;
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set @a=_latin2'test' collate latin2_general_ci;
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select charset(@a),collation(@a),coercibility(@a);
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select @a=_latin2'TEST';
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select @a=_latin2'TEST' collate latin2_bin;
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#
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# Check the same invoking Item_set_user_var
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#
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select charset(@a:=_latin2'test');
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select collation(@a:=_latin2'test');
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select coercibility(@a:=_latin2'test');
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select collation(@a:=_latin2'test' collate latin2_bin);
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select coercibility(@a:=_latin2'test' collate latin2_bin);
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
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select charset(@a),collation(@a),coercibility(@a);
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
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#
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# Bug #6321 strange error:
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# string function FIELD(<uservariable content NULL>, ...)
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#
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set @var= NULL ;
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select FIELD( @var,'1it','Hit') as my_column;
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#
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# Bug#9425 A user variable doesn't always have implicit coercibility
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#
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select @v, coercibility(@v);
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set @v1=null, @v2=1, @v3=1.1, @v4=now();
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select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
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#
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# Bug #9286 SESSION/GLOBAL should be disallowed for user variables
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#
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--error 1064
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set session @honk=99;
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#
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# Bug #10724 @@local not preserved in column name of select
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#
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# The value doesn't actually matter, we just care about the column name
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--replace_column 1 #
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select @@local.max_allowed_packet;
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--replace_column 1 #
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select @@session.max_allowed_packet;
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--replace_column 1 #
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select @@global.max_allowed_packet;
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--replace_column 1 #
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select @@max_allowed_packet;
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--replace_column 1 #
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select @@Max_Allowed_Packet;
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--replace_column 1 #
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select @@version;
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--replace_column 1 #
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select @@global.version;
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--echo End of 4.1 tests
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# Bug #6598: problem with cast(NULL as signed integer);
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#
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set @first_var= NULL;
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create table t1 select @first_var;
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show create table t1;
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drop table t1;
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set @first_var= cast(NULL as signed integer);
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create table t1 select @first_var;
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show create table t1;
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drop table t1;
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set @first_var= NULL;
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create table t1 select @first_var;
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show create table t1;
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drop table t1;
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set @first_var= concat(NULL);
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create table t1 select @first_var;
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show create table t1;
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drop table t1;
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set @first_var=1;
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set @first_var= cast(NULL as CHAR);
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create table t1 select @first_var;
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show create table t1;
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drop table t1;
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#
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# Bug #7498 User variable SET saves SIGNED BIGINT as UNSIGNED BIGINT
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#
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# First part, set user var to large number and select it
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set @a=18446744071710965857;
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select @a;
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# Second part, set user var from large number in table
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# then select it
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CREATE TABLE `bigfailure` (
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`afield` BIGINT UNSIGNED NOT NULL
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);
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INSERT INTO `bigfailure` VALUES (18446744071710965857);
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SELECT * FROM bigfailure;
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select * from (SELECT afield FROM bigfailure) as b;
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select * from bigfailure where afield = (SELECT afield FROM bigfailure);
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select * from bigfailure where afield = 18446744071710965857;
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# This is fixed in 5.0, to be uncommented there
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#select * from bigfailure where afield = '18446744071710965857';
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select * from bigfailure where afield = 18446744071710965856+1;
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SET @a := (SELECT afield FROM bigfailure);
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SELECT @a;
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SET @a := (select afield from (SELECT afield FROM bigfailure) as b);
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SELECT @a;
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SET @a := (select * from bigfailure where afield = (SELECT afield FROM bigfailure));
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SELECT @a;
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drop table bigfailure;
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#
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# Bug#16861: User defined variable can have a wrong value if a tmp table was
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# used.
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#
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create table t1(f1 int, f2 int);
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insert into t1 values (1,2),(2,3),(3,1);
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select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
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select @var;
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create table t2 as select @var:=f2 from t1 group by f1 order by f2 desc limit 1;
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select * from t2;
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select @var;
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drop table t1,t2;
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#
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# Bug#19024 - SHOW COUNT(*) WARNINGS not return Errors
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#
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--error 1064
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insert into city 'blah';
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SHOW COUNT(*) WARNINGS;
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SHOW COUNT(*) ERRORS;
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#
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# Bug#28494: Grouping by Item_func_set_user_var produces incorrect result.
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#
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create table t1(f1 int, f2 varchar(2), f3 float, f4 decimal(2,1));
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insert into t1 values
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(1, "a", 1.5, 1.6), (1, "a", 1.5, 1.6), (2, "b", 2.5, 2.6),
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(3, "c", 3.5, 3.6), (4, "d", 4.5, 4.6), (1, "a", 1.5, 1.6),
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(3, "c", 3.5, 3.6), (1, "a", 1.5, 1.6);
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select @a:=f1, count(f1) from t1 group by 1 desc;
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select @a:=f1, count(f1) from t1 group by 1 asc;
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select @a:=f2, count(f2) from t1 group by 1 desc;
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select @a:=f3, count(f3) from t1 group by 1 desc;
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select @a:=f4, count(f4) from t1 group by 1 desc;
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drop table t1;
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#
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# Bug#32482: Crash for a query with ORDER BY a user variable.
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#
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create table t1 (f1 int);
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insert into t1 values (2), (1);
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select @i := f1 as j from t1 order by 1;
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drop table t1;
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# Bug #32260: User variables in query cause server crash
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#
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create table t1(a int);
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insert into t1 values(5),(4),(4),(3),(2),(2),(2),(1);
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set @rownum := 0;
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set @rank := 0;
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set @prev_score := NULL;
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# Disable the result log as we assign a value to a user variable in one part
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# of a statement and use the same variable in other part of the same statement,
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# so we can get unexpected results.
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--disable_result_log
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select @rownum := @rownum + 1 as row,
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@rank := IF(@prev_score!=a, @rownum, @rank) as rank,
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@prev_score := a as score
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from t1 order by score desc;
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--enable_result_log
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drop table t1;
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#
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# Bug#26020: User-Defined Variables are not consistent with columns data types
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#
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create table t1(b bigint);
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insert into t1 (b) values (10), (30), (10), (10);
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set @var := 0;
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explain select if(b=@var, 999, b) , @var := b from t1 order by b;
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set @var := 0;
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--sorted_result
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select if(b=@var, 999, b) , @var := b from t1 order by b;
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drop table t1;
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create temporary table t1 (id int);
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insert into t1 values (2), (3), (3), (4);
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set @lastid=-1;
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select @lastid != id, @lastid, @lastid := id from t1;
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drop table t1;
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create temporary table t1 (id bigint);
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insert into t1 values (2), (3), (3), (4);
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set @lastid=-1;
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select @lastid != id, @lastid, @lastid := id from t1;
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drop table t1;
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#
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# Bug#42009: SELECT into variable gives different results to direct SELECT
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#
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CREATE TABLE t1(a INT, b INT);
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INSERT INTO t1 VALUES (0, 0), (2, 1), (2, 3), (1, 1), (30, 20);
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SELECT a, b INTO @a, @b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
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SELECT @a, @b;
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SELECT a, b FROM t1 WHERE a=2 AND b=3 GROUP BY a, b;
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DROP TABLE t1;
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#
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# Bug#47371: reference by same column name
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#
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CREATE TABLE t1 (f1 int(11) default NULL, f2 int(11) default NULL);
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CREATE TABLE t2 (f1 int(11) default NULL, f2 int(11) default NULL, foo int(11));
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CREATE TABLE t3 (f1 int(11) default NULL, f2 int(11) default NULL);
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INSERT INTO t1 VALUES(10, 10);
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INSERT INTO t1 VALUES(10, 10);
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INSERT INTO t2 VALUES(10, 10, 10);
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INSERT INTO t2 VALUES(10, 10, 10);
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INSERT INTO t3 VALUES(10, 10);
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INSERT INTO t3 VALUES(10, 10);
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SELECT MIN(t2.f1),
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@bar:= (SELECT MIN(t3.f2) FROM t3 WHERE t3.f2 > foo)
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FROM t1,t2 WHERE t1.f1 = t2.f1 ORDER BY t2.f1;
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DROP TABLE t1, t2, t3;
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--echo End of 5.0 tests
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#
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# Bug#42188: crash and/or memory corruption with user variables in trigger
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#
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CREATE TABLE t1 (i INT);
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CREATE TRIGGER t_after_insert AFTER INSERT ON t1 FOR EACH ROW SET @bug42188 = 10;
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INSERT INTO t1 VALUES (1);
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--change_user root,,test
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INSERT INTO t1 VALUES (1);
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DROP TABLE t1;
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#
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# Bug #55615: debug assertion after using variable in assignment and
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# referred to
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# Bug #55564: crash with user variables, assignments, joins...
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#
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CREATE TABLE t1(a INT);
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INSERT INTO t1 VALUES (0),(0);
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--echo # BUG#55615 : should not crash
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SELECT (@a:=(SELECT @a:=1 FROM t1 LIMIT 1)) AND COUNT(1) FROM t1 GROUP BY @a;
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--echo # BUG#55564 : should not crash
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SELECT IF(
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@v:=LEAST((SELECT 1 FROM t1 t2 LEFT JOIN t1 ON (@v) GROUP BY t1.a), a),
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count(*), 1)
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FROM t1 GROUP BY a LIMIT 1;
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DROP TABLE t1;
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#
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# BUG#56138 "valgrind errors about overlapping memory when
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# double-assigning same variable"
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#
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select @v:=@v:=sum(1) from dual;
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#
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# Bug #57187: more user variable fun with multiple assignments and
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# comparison in query
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#
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CREATE TABLE t1(a DECIMAL(31,21));
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INSERT INTO t1 VALUES (0);
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SELECT (@v:=a) <> (@v:=1) FROM t1;
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DROP TABLE t1;
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#
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# lp:1001506 Crash on a query with GROUP BY and user variables
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# MySQL Bug #11764372 57197: EVEN MORE USER VARIABLE CRASHING FUN
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#
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CREATE TABLE t1(a int);
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INSERT INTO t1 VALUES (1), (2);
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SELECT DISTINCT @a:=MIN(t1.a) FROM t1, t1 AS t2
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GROUP BY @b:=(SELECT COUNT(*) > t2.a);
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DROP TABLE t1;
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#
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#
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# Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT
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# SAME USER VARIABLE = CRASH
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#
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SET @bug12408412=1;
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SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412;
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--echo End of 5.1 tests
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#
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# MDEV-616 lp:1002126
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# Bug #11764371 57196: MORE FUN WITH ASSERTION: !TABLE->FILE ||
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# TABLE->FILE->INITED == HANDLER::
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#
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CREATE TABLE t1(a INT);
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INSERT INTO t1 VALUES (0);
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SELECT DISTINCT POW(COUNT(*), @a:=(SELECT 1 FROM t1 LEFT JOIN t1 AS t2 ON @a))
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AS b FROM t1 GROUP BY a;
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SELECT @a;
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DROP TABLE t1;
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CREATE TABLE t1(f1 INT, f2 INT);
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INSERT INTO t1 VALUES (1,2),(2,3),(3,1);
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CREATE TABLE t2(a INT);
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INSERT INTO t2 VALUES (1);
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SET @var=NULL;
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SELECT @var:=(SELECT f2 FROM t2 WHERE @var) FROM t1 GROUP BY f1 ORDER BY f2 DESC
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LIMIT 1;
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SELECT @var;
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DROP TABLE t1, t2;
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CREATE TABLE t1(a INT);
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INSERT INTO t1 VALUES (0),(1),(3);
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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;
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SELECT @a;
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DROP TABLE t1;
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--echo End of 5.2 tests
|
|
|
|
#
|
|
# Bug#50511: Sometimes wrong handling of user variables containing NULL.
|
|
#
|
|
|
|
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;
|
|
|
|
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; # INT
|
|
SET @aux = NULL;
|
|
INSERT INTO test.t1 (f1, f2) VALUES (1, 1), (@aux, 2);
|
|
|
|
SET @aux = 'text'; # STRING
|
|
SET @aux = NULL;
|
|
INSERT INTO t1(f1, f2) VALUES (1, 3), (@aux, 4);
|
|
|
|
SELECT f1, f2 FROM t1 ORDER BY f2;
|
|
|
|
DROP TRIGGER trg1;
|
|
DROP TABLE t1;
|
|
|
|
--echo #
|
|
--echo # Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT
|
|
--echo # SAME USER VARIABLE = CRASH
|
|
--echo #
|
|
|
|
SET @bug12408412=1;
|
|
SELECT GROUP_CONCAT(@bug12408412 ORDER BY 1) INTO @bug12408412;
|
|
|
|
#
|
|
# MDEV-616 LP BUG#1002126
|
|
# Bug #11764371 57196: MORE FUN WITH ASSERTION: !TABLE->FILE ||
|
|
# TABLE->FILE->INITED == HANDLER::
|
|
#
|
|
|
|
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;
|
|
SELECT @a;
|
|
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;
|
|
SELECT @var;
|
|
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;
|
|
SELECT @a;
|
|
DROP TABLE t1;
|
|
|
|
--echo End of 5.5 tests
|
|
|
|
--echo #
|
|
--echo # Check that used memory extends if we set a variable
|
|
--echo #
|
|
|
|
# Execute twice so number stablizes a bit
|
|
let $tmp= `select memory_used from information_schema.processlist`;
|
|
set @var= repeat('a',20000);
|
|
let $tmp2= `select memory_used from information_schema.processlist`;
|
|
--disable_query_log
|
|
--disable_column_names
|
|
eval select $tmp < $tmp2;
|
|
--enable_column_names
|
|
--enable_query_log
|
|
|
|
#
|
|
# MDEV-13897 SELECT @a := MAX(col) FROM t requires full index scan
|
|
#
|
|
explain select @a:=max(seq) from seq_1_to_1000000;
|
|
|
|
# End of 10.1 tests
|
|
|
|
--echo #
|
|
--echo # Start of 10.3 tests
|
|
--echo #
|
|
|
|
--echo #
|
|
--echo # MDEV-12859 Out-of-range error for CREATE..SELECT @a:=EXTRACT(MINUTE_MICROSECOND FROM..
|
|
--echo #
|
|
|
|
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;
|
|
SELECT * FROM t1;
|
|
DROP TABLE t1;
|
|
SET sql_mode=DEFAULT;
|