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Taxonomy: Optimize `wp_delete_term()` for large object counts without a default term. 

When deleting a term, it has to be removed individually from each object it's connected to, which can take some significant time when there are a lot of objects.

By calling `wp_remove_object_terms()` when no default term is required, we can skip the terms fetch/diff step and significantly speed up the deletion process.

Props dd32.
Fixes #52549.
Built from https://develop.svn.wordpress.org/trunk@50389


git-svn-id: http://core.svn.wordpress.org/trunk@50000 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Sergey Biryukov 2021-02-19 14:31:08 +00:00
parent afc3958ab1
commit 1db4b029c3
2 changed files with 8 additions and 1 deletions
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7
wp-includes/taxonomy.php
View File

@ -1943,6 +1943,11 @@ function wp_delete_term( $term, $taxonomy, $args = array() ) {
$object_ids = (array) $wpdb->get_col( $wpdb->prepare( "SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d", $tt_id ) );
foreach ( $object_ids as $object_id ) {
if ( ! isset( $default ) ) {
wp_remove_object_terms( $object_id, $term, $taxonomy );
continue;
}
$terms = wp_get_object_terms(
$object_id,
$taxonomy,
@ -1951,6 +1956,7 @@ function wp_delete_term( $term, $taxonomy, $args = array() ) {
'orderby' => 'none',
)
);
if ( 1 === count( $terms ) && isset( $default ) ) {
$terms = array( $default );
} else {
@ -1959,6 +1965,7 @@ function wp_delete_term( $term, $taxonomy, $args = array() ) {
$terms = array_merge( $terms, array( $default ) );
}
}
$terms = array_map( 'intval', $terms );
wp_set_object_terms( $object_id, $terms, $taxonomy );
}

2
wp-includes/version.php
View File

@ -13,7 +13,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.7-beta3-50388';
$wp_version = '5.7-beta3-50389';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.