get_meta_type()
WP_Meta_Query
get_cast_for_type()
WP_Query
$this->meta_query->get_cast_for_type()
See #21621, [25255]. Built from https://develop.svn.wordpress.org/trunk@25269 git-svn-id: http://core.svn.wordpress.org/trunk@25235 1a063a9b-81f0-0310-95a4-ce76da25c4cd