[wp-trac] [WordPress Trac] #56992: The Loop displays incorrect data for queries started with `fields => 'id=>parent'`.

[WordPress Trac]

#56992: The Loop displays incorrect data for queries started with `fields =>
'id=>parent'`.
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 Reporter:  peterwilsoncc                        |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  6.8
Component:  Query                                |     Version:  3.1
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests dev-        |     Focuses:
  feedback 2nd-opinion                           |
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Comment (by peterwilsoncc):

 @SirLouen Are you able to clarify the concerns were discussing with
 @oglekler? I think you're worried about the change is return type for
 `WP_Query::next_post()` but I might be missing something. Is that correct?

 Re the performance concern: When `WP_Query::the_post()` is called, the
 cache is primed for all posts returned by the query. The same isn't true
 for `WP_Query::next_post()` although it is intended that when traversing
 the loop the former is called. If it proves to be a performance issue, it
 might be possible to prime the cache it the `next_post` method too.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56992#comment:9>
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