[wp-trac] [WordPress Trac] #24245: Convert category__and query into category__in when only one category passed in

[WordPress Trac]

#24245: Convert category__and query into category__in when only one category passed
in
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 Reporter:  batmoo       |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Query        |    Version:
 Severity:  normal       |   Keywords:
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 If a {{{category__and}}} query gets only one term passed in, it still
 builds out the complex query required for the {{{AND}}} lookup, which can
 be pretty expensive (#16706).

 We should be smarter and automatically convert the query into a
 {{{category__in}}} when {{{category__and}}} only gets passed in one
 category.

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Ticket URL: <http://core.trac.wordpress.org/ticket/24245>
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