get_{$adjacent}_post_join
Filter Hook: Filters the JOIN clause in the SQL for an adjacent post query.
Source: wp-includes/link-template.php:1699
Filter Hook: Filters the JOIN clause in the SQL for an adjacent post query.
Source: wp-includes/link-template.php:1699
Filter Hook: Filters the WHERE clause in the SQL for an adjacent post query.
Source: wp-includes/link-template.php:1716