[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                          |       Type:  enhancement
   Status:  new                                  |   Priority:  normal
Milestone:  Awaiting Review                      |  Component:  Query
  Version:                                       |   Severity:  normal
 Keywords:  has-patch needs-testing dev-         |
  feedback                                       |
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 This is part of the chain of thought from #19729

 The corresponding fix for #19729 was done in [22103]

 I believe this fix didn't take things far enough. For example, a
 meta_query that does a lot of comparing on the same meta_key, will have a
 JOIN and a WHERE for each query array. It shouldn't have to re-join the
 postmeta table on each query array though, since they are based on the
 same meta_key.

 I'll attach a suggested patch that will only join if it needs to, and use
 the previous alias for the first meta_key joined table if it's already
 been joined.

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Ticket URL: <http://core.trac.wordpress.org/ticket/24093>
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