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f17a536e09
used. Sorting by RAND() uses a temporary table in order to get a correct results. User defined variable was set during filling the temporary table and later on it is substituted for its value from the temporary table. Due to this it contains the last value stored in the temporary table. Now if the result_field is set for the Item_func_set_user_var object it updates variable from the result_field value when being sent to a client. The Item_func_set_user_var::check() now accepts a use_result_field parameter. Depending on its value the result_field or the args[0] is used to get current value.
214 lines
6.1 KiB
Text
214 lines
6.1 KiB
Text
# Initialise
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--disable_warnings
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drop table if exists t1,t2;
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--enable_warnings
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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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--error 1382
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set one_shot @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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# End of 4.1 tests
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#
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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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drop table t1;
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