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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 | 
|---|---|
| 3577 |            * Splitting the query will cause it to fetch just the IDs of the found posts | 
| 3578 |            * (and then individually fetch each post by ID), rather than fetching every | 
| 3579 |            * complete row at once. One massive result vs. many small results. | 
| 3580 |            * | 
| 3581 |            * @since 3.4.0 | 
| 3582 |            * | 
| 3583 |            * @param bool     $split_the_query Whether or not to split the query. | 
| 3584 |            * @param WP_Query $this            The WP_Query instance. | 
| 3585 |            */ | 
| 3586 |           $split_the_query = apply_filters( 'split_the_query', $split_the_query, $this ); | 
| 3587 |  | 
| 3588 |           if ( $split_the_query ) { | 
| 3589 |                // First get the IDs and then fill in the objects | 
| 3590 |  | 
| 3591 |                $this->request = "SELECT $found_rows $distinct $wpdb->posts.ID FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits"; | 
| 3592 |  | 
| 3593 |                /** | 
| 3594 |                 * Filter the Post IDs SQL request before sending. | 
| 3595 |                 * |