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Fix for bug #23254: COMPRESS(NULL) makes all futher COMPRESS() calls on same Item return NULL

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We don't set null_value to 0 in the Item_func_compress::val_str() for 
not-NULL results.
This commit is contained in:
ramil/ram@mysql.com/myoffice.izhnet.ru 2006-10-13 19:05:54 +05:00
parent 2db82814c4
commit 31402835d4
3 changed files with 24 additions and 1 deletions
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10
mysql-test/r/func_compress.result
View file

@ -79,3 +79,13 @@ uncompress(a) uncompressed_length(a)
NULL NULL
a 1
drop table t1;
create table t1(a blob);
insert into t1 values ('0'), (NULL), ('0');
select compress(a), compress(a) from t1;
select compress(a) is null from t1;
compress(a) is null
0
1
0
drop table t1;
End of 4.1 tests

14
mysql-test/t/func_compress.test
View file

@ -54,4 +54,16 @@ insert into t1 values(NULL), (compress('a'));
select uncompress(a), uncompressed_length(a) from t1;
drop table t1;
# End of 4.1 tests
#
# Bug #23254: problem with compress(NULL)
#
create table t1(a blob);
insert into t1 values ('0'), (NULL), ('0');
--disable_result_log
select compress(a), compress(a) from t1;
--enable_result_log
select compress(a) is null from t1;
drop table t1;
--echo End of 4.1 tests

1
sql/item_strfunc.cc
View file

@ -2838,6 +2838,7 @@ String *Item_func_compress::val_str(String *str)
null_value= 1;
return 0;
}
null_value= 0;
if (res->is_empty()) return res;
/*