Boone Gorges 3c028a80d4 Allow comment_exists() to match based on GMT date. ...

The `comment_date_gmt` field of the `wp_comments` table is indexed, which makes
`WHERE` matches against the field much faster than against the unindexed
`comment_date`. For bulk operations like data import, the speed difference can
be meaningful.

We continue to default to 'blog' for `$timezone`, to preserve compatibility
with existing uses.

Props apokalyptik.
Fixes #33871.
Built from https://develop.svn.wordpress.org/trunk@34460


git-svn-id: http://core.svn.wordpress.org/trunk@34424 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2015-09-23 18:16:26 +00:00

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