[wp-trac] [WordPress Trac] #22191: In update_metadata(), compare old/new values before deciding whether to call add_metadata()

[WordPress Trac]

#22191: In update_metadata(), compare old/new values before deciding whether to
call add_metadata()
-----------------------+--------------------------
 Reporter:  nacin      |       Type:  defect (bug)
   Status:  new        |   Priority:  normal
Milestone:  3.5        |  Component:  Performance
  Version:             |   Severity:  normal
 Keywords:  has-patch  |
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 In update_metadata(), we query for a meta_id of an existing key. If it
 exists, we continue. If we get nothing back, we call add_metadata().

 We also compare the old value with the new value, and if they are the
 same, we bail.

 Since that old value is from cache, it is possible for update_metadata()
 to not run a single query on its own if there is nothing to update. Only,
 we do, because we do the meta_id query first.

 We should do the meta_id query second. This is the same pattern used by
 update_option().

 Related: #22191, the strict type comparison causes false negatives.

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Ticket URL: <http://core.trac.wordpress.org/ticket/22191>
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