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A user variable are now always have IMPLICIT coercibility,

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independently from the expression it is initialized from.
In other words, this change treats a user variable like
a table with one column and one record. Discussed with 
PeterG, Serg and Lars. This change also simplifies replication
allowing not to replicate variables' coercibility.
This commit is contained in:
bar@mysql.com
2005-02-22 15:55:40 +04:00
parent c0230f6f5f
commit 89a5530822
3 changed files with 14 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
mysql-test/r/user_var.result
View File

@ -123,7 +123,7 @@ drop table t1;
set @a=_latin2'test';
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 3
latin2 latin2_general_ci 2
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
@ -133,12 +133,13 @@ select @a=_latin2'TEST' collate latin2_bin;
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 0
latin2 latin2_general_ci 2
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
select @a=_latin2'TEST' collate latin2_bin;
ERROR HY000: Illegal mix of collations (latin2_general_ci,EXPLICIT) and (latin2_bin,EXPLICIT) for operation '='
@a=_latin2'TEST' collate latin2_bin
0
select charset(@a:=_latin2'test');
charset(@a:=_latin2'test')
latin2
@ -147,21 +148,22 @@ collation(@a:=_latin2'test')
latin2_general_ci
select coercibility(@a:=_latin2'test');
coercibility(@a:=_latin2'test')
3
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)
0
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 0
latin2 latin2_bin 2
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
ERROR HY000: Illegal mix of collations (latin2_bin,EXPLICIT) and (latin2_general_ci,EXPLICIT) for operation '='
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
1
create table t1 (a varchar(50));
reset master;
SET TIMESTAMP=10000;

2
mysql-test/t/user_var.test
View File

@ -84,7 +84,6 @@ select @a=_latin2'TEST' collate latin2_bin;
set @a=_latin2'test' collate latin2_general_ci;
select charset(@a),collation(@a),coercibility(@a);
select @a=_latin2'TEST';
--error 1267
select @a=_latin2'TEST' collate latin2_bin;
#
@ -97,7 +96,6 @@ select collation(@a:=_latin2'test' collate latin2_bin);
select coercibility(@a:=_latin2'test' collate latin2_bin);
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
select charset(@a),collation(@a),coercibility(@a);
--error 1267
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
# Check that user variables are binlogged correctly (BUG#3875)

10
sql/item_func.cc
View File

@ -2361,7 +2361,7 @@ static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
entry->value=0;
entry->length=0;
entry->update_query_id=0;
entry->collation.set(NULL, DERIVATION_NONE);
entry->collation.set(NULL, DERIVATION_IMPLICIT);
/*
If we are here, we were called from a SET or a query which sets a
variable. Imagine it is this:
@ -2419,8 +2419,8 @@ bool Item_func_set_user_var::fix_fields(THD *thd, TABLE_LIST *tables,
and the variable has previously been initialized.
*/
if (!entry->collation.collation || !args[0]->null_value)
entry->collation.set(args[0]->collation);
collation.set(entry->collation);
entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
cached_result_type= args[0]->result_type();
return 0;
}
@ -2432,7 +2432,7 @@ Item_func_set_user_var::fix_length_and_dec()
maybe_null=args[0]->maybe_null;
max_length=args[0]->max_length;
decimals=args[0]->decimals;
collation.set(args[0]->collation);
collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
}
@ -2659,7 +2659,7 @@ Item_func_set_user_var::update()
res= update_hash((void*) save_result.vstr->ptr(),
save_result.vstr->length(), STRING_RESULT,
save_result.vstr->charset(),
args[0]->collation.derivation);
DERIVATION_IMPLICIT);
break;
}
case ROW_RESULT: