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wordpress/wp-includes
Peter Wilson fa5a6c8622 Taxonomy: Improve performance of term recounting database queries.
When modifying terms assigned to an object, replace full term recounts with incrementing/decrementing the count as appropriate. This provides a significant performance boost on sites with a high number of term/object relationships and/or posts.

Introduces the functions `wp_increment_term_count()`, `wp_decrement_term_count()`, `wp_modify_term_count_by()` and `wp_modify_term_count_by_now()` for updating the term count.

Introduces the function `_wp_prevent_term_counting()` for preventing double counting on posts that are about to transition.

Adds the parameter `update_count_by_callback` to `register_taxonomy()` to allow developers to use a custom callback for incrementing or decrementing a term count.

Props boonebgorges, davidbaumwald, hellofromTonya, johnbillion, lcyh78, mattoperry, peterwilsoncc, rebasaurus, whyisjake.
Fixes #40351.


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git-svn-id: http://core.svn.wordpress.org/trunk@48903 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-10-14 00:51:06 +00:00
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