https://bugzilla.wikimedia.org/show_bug.cgi?id=34568

--- Comment #1 from Aaron Schulz <[email protected]> 2012-02-22 07:28:55 
UTC ---
This is not a feature for performance reasons. There is no (page_title) index,
only (page_namespace,page_title). We only want to query pages where
page_namespace refers to a reviewable namespace, so we want to use the
(page_namespace,page_title) index. If we want "all reviewable namespaces", we
have to sort/page on (namespace,title) and not just (title) anymore to avoid
sorting.

If we sorted/paged on page_id, an "(all)" option would be doable, though slower
given that the "page_namespace is reviewable" condition would not use an index.

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