WordPress/wp-includes
Boone Gorges da8a602ad6 Improve performance of trackback query in do_all_pings().
Previously, the direct SQL query used to identify trackbacks in
`do_all_pings()` performed poorly, due to an unindexed query against the
`to_ping` column. We improve performance in two ways. First, we switch
to using a postmeta flag for posts that require trackbacks to be sent;
queries joining against the postmeta table that check only the `meta_key`
are generally quite fast. Second, we switch to the use of `WP_Query`,
making the query cacheable and filterable using standard methods.

Props dshanske, spacedmonkey, janw.oostendorp, mrmadhat, birgire.
Fixes #36824.
Built from https://develop.svn.wordpress.org/trunk@46178


git-svn-id: http://core.svn.wordpress.org/trunk@45990 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2019-09-19 02:06:56 +00:00
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