https://bugzilla.wikimedia.org/show_bug.cgi?id=50078

--- Comment #12 from T. Gries <[email protected]> ---
André: just as an example: under certain circumstances, the Extension:UserMerge
needs this patch to allow a multi-row delete, and this requires a LIST_OR
condition (instead of LIST_AND as default). See
https://git.wikimedia.org/blob/mediawiki%2Fextensions%2FUserMerge/c74427a0f6934f877a398a78e579dc96b9d9be12/UserMerge_body.php#L374
. 

I found the description 

"Database::delete documentation says that $conds maybe string|array, but when
string is given, it is also treated with makeList( ..., LIST_AND) -- instead
treated as plain database statement (e.g. when $conds is manually constructed
as explained in [1])" 

wrong 

when compared to what the core code was actually doing on that date 2013-06-24.

So not backporting this means (only) that the extension UserMerge might fail on
such wikis.

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