Boone Gorges e202610ac8 Comments: Improve caching for hierarchical queries. ...

Hierarchical comment queries work by first fetching the IDs of top-level
comments, and then filling the descendant tree one level at a time based on the
top-level results. When top-level comment IDs are found in the cache,
`WP_Comment_Query` does not generate the SQL used to fetch these comments. In
this case, the `fill_descendants()` query does not have enough information
to fill children. As a result, descendant comments were failing to be filled
in cases where the top-level comments were found in the cache.

This was a minor bug previously, because comment caches were not maintained
between pageloads. Since comment caches are now persistent [37613], the problem
becomes evident anywhere that a persistent object cache is in use.

The solution is to cache parent-child relationships, so that when top-level
comments are found in the cache, descendant comments should be found there as
well.

Fixes #36487.
Built from https://develop.svn.wordpress.org/trunk@37625


git-svn-id: http://core.svn.wordpress.org/trunk@37593 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-06-02 18:28:27 +00:00

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