Hi Elena, That switch does yield the correct results. I've filed a bug: https://mariadb.atlassian.net/browse/MDEV-5107 Thanks, Jamie On Fri, Oct 4, 2013 at 4:45 PM, Elena Stepanova <elenst@montyprogram.com>wrote:

Hi Jamie,

On 10/4/2013 9:39 PM, Jamie Jackson wrote:

...

Hi Folks,

I'm seeing a difference in a query result between MariaDB 5.5.32 and MySQL 5.1.69.

I've distilled things down as far as I can get them, while still being able to reproduce the issue. Anything else I do to get the sample to make it smaller or more focused seems to make the issue disappear.

The data: https://www.dropbox.com/s/**m02sqjl2y2cq4ky/sampledump1.**zip<https://www.dropbox.com/s/m02sqjl2y2cq4ky/sampledump1.zip>

The query, and the results (and explains) in both MySQL and MariaDB:

https://gist.github.com/**jamiejackson/6829118<https://gist.github.com/jamiejackson/6829118>

What's going on here? Is there an oustanding bug for this? Should I file a bug?

Yes, please file a bug at https://mariadb.atlassian.net/** secure/Dashboard.jspa<https://mariadb.atlassian.net/secure/Dashboard.jspa>. We have a few bugs with wrong results currently in work, but I can't find right away any that matches your scenario.

As a workaround, please try set optimizer_switch='derived_**merge=off';

Regards, Elena

...

Thanks, Jamie

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