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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code | 
|---|---|
| 2432 |                if ( !$q['suppress_filters'] ) { | 
| 2433 |                     /** | 
| 2434 |                      * Filters the JOIN clause of the comments feed query before sending. | 
| 2435 |                      * | 
| 2436 |                      * @since 2.2.0 | 
| 2437 |                      * | 
| 2438 |                      * @param string   $cjoin The JOIN clause of the query. | 
| 2439 |                      * @param WP_Query &$this The WP_Query instance (passed by reference). | 
| 2440 |                      */ | 
| 2441 |                     $cjoin = apply_filters_ref_array( 'comment_feed_join', array( $cjoin, &$this ) ); | 
| 2442 |  | 
| 2443 |                     /** | 
| 2444 |                      * Filters the WHERE clause of the comments feed query before sending. | 
| 2445 |                      * | 
| 2446 |                      * @since 2.2.0 | 
| 2447 |                      * | 
| 2448 |                      * @param string   $cwhere The WHERE clause of the query. | 
| 2449 |                      * @param WP_Query &$this  The WP_Query instance (passed by reference). | 
| 2450 |                      */ | 
| Line | Code | 
| 2861 |                 * | 
| 2862 |                 * @param array    $posts The post results array. | 
| 2863 |                 * @param WP_Query &$this The WP_Query instance (passed by reference). | 
| 2864 |                 */ | 
| 2865 |                $this->posts = apply_filters_ref_array( 'posts_results', array( $this->posts, &$this ) ); | 
| 2866 |           } | 
| 2867 |  | 
| 2868 |           if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) { | 
| 2869 |                /** This filter is documented in wp-includes/query.php */ | 
| 2870 |                $cjoin = apply_filters_ref_array( 'comment_feed_join', array( '', &$this ) ); | 
| 2871 |  | 
| 2872 |                /** This filter is documented in wp-includes/query.php */ | 
| 2873 |                $cwhere = apply_filters_ref_array( 'comment_feed_where', array( "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'", &$this ) ); | 
| 2874 |  | 
| 2875 |                /** This filter is documented in wp-includes/query.php */ | 
| 2876 |                $cgroupby = apply_filters_ref_array( 'comment_feed_groupby', array( '', &$this ) ); | 
| 2877 |                $cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : ''; | 
| 2878 |  | 
| 2879 |                /** This filter is documented in wp-includes/query.php */ |