[wp-trac] [WordPress Trac] #18158: Meta Query for posts with a meta key not set (IS NULL).

[WordPress Trac]

#18158: Meta Query for posts with a meta key not set (IS NULL).
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 Reporter:  johnnyb                  |       Owner:  georgestephanis
     Type:  enhancement              |      Status:  accepted
 Priority:  normal                   |   Milestone:  3.4
Component:  Query                    |     Version:  3.2.1
 Severity:  normal                   |  Resolution:
 Keywords:  needs-testing has-patch  |
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Comment (by scribu):

 Actually, 'compare' => 'EXISTS' is totally unnecessary. Doing an INNER
 JOIN is enough to ensure that the value is not null.

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Ticket URL: <http://core.trac.wordpress.org/ticket/18158#comment:26>
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