[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:  peterwilsoncc
     Type:  defect (bug)              |      Status:  reopened
 Priority:  normal                    |   Milestone:  6.8
Component:  Query                     |     Version:  3.1
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by peterwilsoncc):

 > Yesterday I was thinking: If this has been like this for a good time, as
 I said, performance impact could occur on those who were not needed to
 fully hydrate the global post as I showed in my example.

 With the changes in the WIP pull request, the performance impact is only
 affecting starting the loop for queries that are initiated with a partial
 data set, ie `id, parent`. This is expected as the extra database queries
 are what fixes the bug.

 I don't think there is any benefit of adding a new parameter to bypass the
 bug fix as the partial data remains available via the posts property. The
 change in this PR makes the loop consistent with how it now works with
 `id` and `all`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56992#comment:48>
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