[wp-trac] [WordPress Trac] #30681: Using a value in a meta_query (in WP_Query) combined with EXISTS OR NOT EXISTS breaks query

[WordPress Trac]

#30681: Using a value in a meta_query (in WP_Query) combined with EXISTS OR NOT
EXISTS breaks query
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 Reporter:  barrykooij    |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 From 3.9 and up you don't have to specify a value when using the 'EXISTS'
 or 'NOT EXISTS' comparisons in meta_query in WP_Query. I still do, to
 prevent those annoying bugs for people on 3.8 and lower. This will break
 in WordPress 4.1.

 Attached patch fixes this problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/30681>
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