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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.
| Line | Code | 
|---|---|
| 2929 |           if ( ! $q['suppress_filters'] ) { | 
| 2930 |                /** | 
| 2931 |                 * Filters the completed SQL query before sending. | 
| 2932 |                 * | 
| 2933 |                 * @since 2.0.0 | 
| 2934 |                 * | 
| 2935 |                 * @param string   $request The complete SQL query. | 
| 2936 |                 * @param WP_Query $query   The WP_Query instance (passed by reference). | 
| 2937 |                 */ | 
| 2938 |                $this->request = apply_filters_ref_array( 'posts_request', array( $this->request, &$this ) ); | 
| 2939 |           } | 
| 2940 |  | 
| 2941 |           /** | 
| 2942 |            * Filters the posts array before the query takes place. | 
| 2943 |            * | 
| 2944 |            * Return a non-null value to bypass WordPress' default post queries. | 
| 2945 |            * | 
| 2946 |            * Filtering functions that require pagination information are encouraged to set | 
| 2947 |            * the `found_posts` and `max_num_pages` properties of the WP_Query object, |