mariadb/mysql-test
timour@mysql.com 294498e203 Fix for BUG#11185.
The source of the problem is in Field_longlong::cmp. If 'this' is
an unsigned number, the method casts both the current value, and
the constant that we compare with to an unsigned number. As a
result if the constant we compare with is a negative number, it
wraps to some unsigned number, and the comparison is incorrect.

When the optimizer chooses the "range" access method, this problem
causes handler::read_range_next to reject the current key when the
upper bound key is a negative number because handler::compare_key
incorrectly considers the positive and negative keys to be equal.

The current patch does not correct the source of the problem in
Field_longlong::cmp because it is not easy to propagate sign
information about the constant at query execution time. Instead
the patch changes the range optimizer so that it never compares
unsiged fields with negative constants. As an added benefit,
queries that do such comparisons will execute faster because
the range optimizer replaces conditions like:
(a) (unsigned_int [< | <=] negative_constant) == FALSE
(b) (unsigned_int [> | >=] negative_constant) == TRUE
with the corresponding constants.
In some cases this may even result in constant time execution.
2005-06-23 10:56:44 +03:00
..
include
lib
misc
ndb
r Fix for BUG#11185. 2005-06-23 10:56:44 +03:00
std_data
suite/jp
t
create-test-result
fix-result
init_db.sql
install_test_db.sh
Makefile.am
my_create_tables.c
my_manage.c
my_manage.h
mysql-test-run.pl
mysql-test-run.sh
mysql_test_run_new.c
README
README.gcov
resolve-stack
suppress.purify

This directory contains a test suite for mysql daemon. To run
the currently existing test cases, simply execute ./mysql-test-run in
this directory. It will fire up the newly built mysqld and test it.

If you want to run the test with a running MySQL server use the --external
option to mysql-test-run.

Note that you do not have to have to do make install, and you could
actually have a co-existing MySQL installation - the tests will not
conflict with it.

All tests must pass. If one or more of them fail on your system, please
read the following manual section of how to report the problem:

http://dev.mysql.com/doc/mysql/en/MySQL_test_suite.html


You can create your own test cases. To create a test case:

 xemacs t/test_case_name.test

 in the file, put a set of SQL commands that will create some tables,
 load test data, run some queries to manipulate it.

 We would appreciate if the test tables were called t1, t2, t3 ... (to not
 conflict too much with existing tables).

 Your test should begin by dropping the tables you are going to create and
 end by dropping them again.  This will ensure that one can run the test
 over and over again.
 
 If you are using mysqltest commands (like result file names) in your
 test case you should do create the result file as follows:

 mysql-test-run --record test_case_name

 or

 mysqltest --record < t/test_case_name.test

 If you only have a simple test cases consistent of SQL commands and comments
 you can create the test case one of the following ways:

 mysql-test-run --record test_case_name

 mysql test < t/test_case_name.test > r/test_case_name.result

 mysqltest --record --record-file=r/test_case_name.result < t/test_case_name.test

 When this is done, take a look at r/test_case_name.result
 - If the result is wrong, you have found a bug;  In this case you should
   edit the test result to the correct results so that we can verify
   that the bug is corrected in future releases.

To submit your test case, put your .test file and .result file(s) into
a tar.gz archive, add a README that explains the problem, ftp the 
archive to ftp://support.mysql.com/pub/mysql/secret/ and send  a mail
to bugs@lists.mysql.com