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f70ae3a6de
The end_update() function uses the Item::save_org_in_field() function to save original values of items into the group buffer. But for the Item_func_set_user_var this method was mapped to the save_in_field method. The latter function wrongly decides to use the result_field. This leads to saving incorrect value in the grouping buffer and wrong result of the whole query. The can_use_result_field argument of the bool type is added to the Item_func_set_user_var::save_in_field() function. If it is set to FALSE then the item's result field won't be used. Otherwise it will be detected whether the result field will be used (old behaviour). Two wrapping functions for the function above are added to the Item_func_set_user_var class: the save_in_field(Field *field, bool no_conversions) - it calls the above function with the can_use_result_field set to TRUE. the save_org_in_field(Field *field) - same, but the can_use_result_field is set to FALSE.
326 lines
8.7 KiB
Text
326 lines
8.7 KiB
Text
drop table if exists t1,t2;
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set @a := foo;
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ERROR 42S22: Unknown column 'foo' in 'field list'
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set @a := connection_id() + 3;
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select @a - connection_id();
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@a - connection_id()
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3
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set @b := 1;
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select @b;
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@b
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1
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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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i
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1
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2
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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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i @vv1:=if(sv1.i,1,0) @vv2:=if(sv2.i,1,0) @vv3:=if(sv3.i,1,0) @vv1+@vv2+@vv3
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1 1 0 1 2
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2 1 0 0 1
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 1
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select @vv1,i,v from t1 where i=@vv1;
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@vv1 i v
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1 1 1
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1 1 3
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explain select * from t1 where @vv1:=@vv1+1 and i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
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explain select @vv1:=i from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL i 4 NULL 3 Using where; Using index
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explain select * from t1 where i=@vv1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref i i 4 const 1
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drop table t1,t2;
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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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@a:=10 @b:=1 @a > @b @a < @b
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10 1 1 0
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select @a:="10", @b:="1", @a > @b, @a < @b;
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@a:="10" @b:="1" @a > @b @a < @b
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10 1 1 0
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select @a:=10, @b:=2, @a > @b, @a < @b;
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@a:=10 @b:=2 @a > @b @a < @b
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10 2 0 1
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select @a:="10", @b:="2", @a > @b, @a < @b;
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@a:="10" @b:="2" @a > @b @a < @b
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10 2 1 0
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select @a:=1;
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@a:=1
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1
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select @a, @a:=1;
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@a @a:=1
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1 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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@c:=0
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0
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update t1 SET id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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update t1 set id=(@c:=@c+1);
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select @c;
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@c
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1
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select @c:=0;
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@c:=0
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0
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select @c:=@c+1;
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@c:=@c+1
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1
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select @d,(@d:=id),@d from t1;
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@d (@d:=id) @d
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NULL 1 1
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select @e,(@e:=d),@e from t1;
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@e (@e:=d) @e
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NULL 2 2
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select @f,(@f:=c),@f from t1;
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@f (@f:=c) @f
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NULL test test
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set @g=1;
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select @g,(@g:=c),@g from t1;
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@g (@g:=c) @g
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1 test test
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select @c, @d, @e, @f;
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@c @d @e @f
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1 1 2 test
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select @d:=id, @e:=id, @f:=id, @g:=@id from t1;
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@d:=id @e:=id @f:=id @g:=@id
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1 1 1 NULL
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select @c, @d, @e, @f, @g;
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@c @d @e @f @g
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1 1 1 1 NULL
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drop table t1;
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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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@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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10 2 1 10 2 1 10 2 1 10 2 1
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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;
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@a:=0
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0
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select @a, @a:=@a+count(*), count(*), @a from t1 group by i;
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@a @a:=@a+count(*) count(*) @a
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0 1 1 0
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0 2 2 0
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0 3 3 0
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select @a:=0;
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@a:=0
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0
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select @a+0, @a:=@a+0+count(*), count(*), @a+0 from t1 group by i;
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@a+0 @a:=@a+0+count(*) count(*) @a+0
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0 1 1 0
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1 3 2 0
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3 6 3 0
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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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@a @a:="hello" @a @a:=3 @a @a:="hello again"
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0 hello 0 3 0 hello again
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0 hello 0 3 0 hello again
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0 hello 0 3 0 hello again
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select @a,@a:="hello",@a,@a:=3,@a,@a:="hello again" from t1 group by i;
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@a @a:="hello" @a @a:=3 @a @a:="hello again"
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hello again hello hello again 3 hello again hello again
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hello again hello hello again 3 hello again hello again
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hello again hello hello again 3 hello again hello again
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drop table t1;
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set @a=_latin2'test';
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 2
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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@a=_latin2'TEST' collate latin2_bin
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0
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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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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_general_ci 2
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select @a=_latin2'TEST';
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@a=_latin2'TEST'
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1
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select @a=_latin2'TEST' collate latin2_bin;
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@a=_latin2'TEST' collate latin2_bin
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0
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select charset(@a:=_latin2'test');
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charset(@a:=_latin2'test')
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latin2
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select collation(@a:=_latin2'test');
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collation(@a:=_latin2'test')
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latin2_general_ci
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select coercibility(@a:=_latin2'test');
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coercibility(@a:=_latin2'test')
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2
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select collation(@a:=_latin2'test' collate latin2_bin);
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collation(@a:=_latin2'test' collate latin2_bin)
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latin2_bin
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select coercibility(@a:=_latin2'test' collate latin2_bin);
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coercibility(@a:=_latin2'test' collate latin2_bin)
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2
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
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(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
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0
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select charset(@a),collation(@a),coercibility(@a);
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charset(@a) collation(@a) coercibility(@a)
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latin2 latin2_bin 2
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select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
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(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
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1
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set @var= NULL ;
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select FIELD( @var,'1it','Hit') as my_column;
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my_column
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0
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select @v, coercibility(@v);
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@v coercibility(@v)
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NULL 2
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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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coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4)
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2 2 2 2
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set session @honk=99;
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@honk=99' at line 1
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set one_shot @honk=99;
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ERROR HY000: The 'SET ONE_SHOT' syntax is reserved for purposes internal to the MySQL server
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select @@local.max_allowed_packet;
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@@local.max_allowed_packet
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#
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select @@session.max_allowed_packet;
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@@session.max_allowed_packet
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#
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select @@global.max_allowed_packet;
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@@global.max_allowed_packet
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#
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select @@max_allowed_packet;
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@@max_allowed_packet
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#
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select @@Max_Allowed_Packet;
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@@Max_Allowed_Packet
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#
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select @@version;
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@@version
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#
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select @@global.version;
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@@global.version
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#
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End of 4.1 tests
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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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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longblob
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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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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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` bigint(20) default NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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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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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` bigint(20) default NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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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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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longblob
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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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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Table Create Table
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t1 CREATE TABLE `t1` (
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`@first_var` longtext
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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set @a=18446744071710965857;
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select @a;
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@a
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18446744071710965857
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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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afield
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18446744071710965857
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select * from (SELECT afield FROM bigfailure) as b;
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afield
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18446744071710965857
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select * from bigfailure where afield = (SELECT afield FROM bigfailure);
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afield
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18446744071710965857
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select * from bigfailure where afield = 18446744071710965857;
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afield
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18446744071710965857
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select * from bigfailure where afield = 18446744071710965856+1;
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afield
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18446744071710965857
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SET @a := (SELECT afield FROM bigfailure);
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SELECT @a;
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@a
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18446744071710965857
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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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@a
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18446744071710965857
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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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@a
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18446744071710965857
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drop table bigfailure;
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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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@var:=f2
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3
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select @var;
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@var
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3
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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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@var:=f2
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3
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select @var;
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@var
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3
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drop table t1,t2;
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insert into city 'blah';
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ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''blah'' at line 1
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SHOW COUNT(*) WARNINGS;
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@@session.warning_count
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1
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SHOW COUNT(*) ERRORS;
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@@session.error_count
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1
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create table t1(f1 int);
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insert into t1 values(1),(1),(2);
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select @a:=f1, count(f1) from t1 group by 1;
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@a:=f1 count(f1)
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1 2
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2 1
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drop table t1;
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