[wp-trac] [WordPress Trac] #24093: WP_Meta_Query is inefficient when referencing the same keys in "OR" query

[WordPress Trac]

#24093: WP_Meta_Query is inefficient when referencing the same keys in "OR" query
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 Reporter:  sc0ttkclark                          |       Owner:
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  Future
Component:  Query                                |  Release
 Severity:  normal                               |     Version:  3.5.1
 Keywords:  needs-refresh meta-query needs-      |  Resolution:
  unit-tests has-patch dev-feedback              |     Focuses:
                                                 |  performance
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Comment (by pento):

 It's worth noting that this will need testing on different versions of
 MySQL (at least the latest major versions from 5.0 to 5.7) - various
 optimisations for both JOINs and sub-queries have been introduced over the
 years, we can't assume that performance on the latest version is
 indicative of performance on all versions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/24093#comment:30>
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