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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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14
mysql-test/t/func_compress.test
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@@ -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