Analysis: So, there were two problems that needed to be fixed. 1) To fix the crash. 2) After fixing the crash, the result was wrong. Reason for crash: When we pass the hash to get_intersect_between_arrays(), We were initialially not passing it value, so the operations were not performed correctly. Reason for wrong result: The number of rows that it was returning were same as that in the table, but, only the first row had correct ouput, rest of them were NULL (it should also be the result of interection). This was because we modified the "items" HASH by deleting the "seen" elements. So for next rows, it did not have the elements it should have in the hash. Fix: 1) To fix the crash: pass the HASH by reference 2) To fix incorrect result: Maintain a separate "seen" hash, if an item is found the the "items" hash, delete it ony temporarily and put it in the seen hash. At then end, put the items from "seen" back into "items" and reset "seen".
Code status:
MariaDB: The innovative open source database
MariaDB was designed as a drop-in replacement of MySQL(R) with more features, new storage engines, fewer bugs, and better performance.
MariaDB is brought to you by the MariaDB Foundation and the MariaDB Corporation. Please read the CREDITS file for details about the MariaDB Foundation, and who is developing MariaDB.
MariaDB is developed by many of the original developers of MySQL who now work for the MariaDB Corporation, the MariaDB Foundation and by many people in the community.
MySQL, which is the base of MariaDB, is a product and trademark of Oracle Corporation, Inc. For a list of developers and other contributors, see the Credits appendix. You can also run 'SHOW authors' to get a list of active contributors.
A description of the MariaDB project and a manual can be found at:
https://mariadb.com/kb/en/mariadb-vs-mysql-features/
https://mariadb.com/kb/en/mariadb-versus-mysql-compatibility/
https://mariadb.com/kb/en/new-and-old-releases/
Getting the code, building it and testing it
Refer to the following guide: https://mariadb.org/get-involved/getting-started-for-developers/get-code-build-test/ which outlines how to build the source code correctly and run the MariaDB testing framework, as well as which branch to target for your contributions.
Help
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Licensing
MariaDB is specifically available only under version 2 of the GNU General Public License (GPLv2). (I.e. Without the "any later version" clause.) This is inherited from MySQL. Please see the README file in the MySQL distribution for more information.
License information can be found in the COPYING file. Third party license information can be found in the THIRDPARTY file.
Bug Reports
Bug and/or error reports regarding MariaDB should be submitted at: https://jira.mariadb.org
For reporting security vulnerabilities, see our security-policy.
The code for MariaDB, including all revision history, can be found at: https://github.com/MariaDB/server