[wp-trac] [WordPress Trac] #16706: Queries using "category__and" are slow on large databases

[WordPress Trac]

#16706: Queries using "category__and" are slow on large databases
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 Reporter:  tigertech    |       Owner:  scribu
     Type:  enhancement  |      Status:  reviewing
 Priority:  normal       |   Milestone:  Future Release
Component:  Performance  |     Version:  3.1
 Severity:  normal       |  Resolution:
 Keywords:  has-patch    |
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Comment (by scribu):

 Also, it only works if the relation between queries is also 'AND', because
 if it's 'OR', you have to group the IN queries that come from an AND one.

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Ticket URL: <http://core.trac.wordpress.org/ticket/16706#comment:9>
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