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Fix bug #14016 date_format() 2nd parameter was compared using case insensitive

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collation

By default constant strings in second parameter of date_time() have case
insensitive collation. Because of this expressions date_format(f,'%m') and 
date_format(f,'%M') wrongly becomes equal, which results in choosing wrong 
column to sort by.

Now if second parameter of date_format() is constant then it's collation is 
changed to case sensitive.


sql/item_timefunc.cc:
  Fix bug #14016 date_format() 2nd parameter was compared using case insensitive collation.
  If second parameter of date_format() is constant then it's collation is changed to case sensitive.
mysql-test/r/date_formats.result:
  Test case for bug#14016 2nd parameter was compared using case insensitive collation
mysql-test/t/date_formats.test:
  Test case for bug#14016 2nd parameter was compared using case insensitive collation
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2005-10-25 20:37:26 +04:00
parent 6e49a48a25
commit b96dbef6fd
3 changed files with 26 additions and 0 deletions
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8
mysql-test/t/date_formats.test
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@@ -260,4 +260,12 @@ select str_to_date("2003-04-05 g", "%Y-%m-%d") as f1,
str_to_date("2003-04-05 10:11:12.101010234567", "%Y-%m-%d %H:%i:%S.%f") as f2;
--enable_ps_protocol
#
# Bug #14016
#
create table t1 (f1 datetime);
insert into t1 (f1) values ("2005-01-01");
insert into t1 (f1) values ("2005-02-01");
select date_format(f1, "%m") as d1, date_format(f1, "%M") as d2 from t1 order by date_format(f1, "%M");
drop table t1;
# End of 4.1 tests