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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 | 
|---|---|
| 3217 |  | 
| 3218 |                /** | 
| 3219 |                 * Filter the ORDER BY clause of the query. | 
| 3220 |                 * | 
| 3221 |                 * @since 1.5.1 | 
| 3222 |                 * | 
| 3223 |                 * @param string   $orderby The ORDER BY clause of the query. | 
| 3224 |                 * @param WP_Query &$this   The WP_Query instance (passed by reference). | 
| 3225 |                 */ | 
| 3226 |                $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); | 
| 3227 |  | 
| 3228 |                /** | 
| 3229 |                 * Filter the DISTINCT clause of the query. | 
| 3230 |                 * | 
| 3231 |                 * @since 2.1.0 | 
| 3232 |                 * | 
| 3233 |                 * @param string   $distinct The DISTINCT clause of the query. | 
| 3234 |                 * @param WP_Query &$this    The WP_Query instance (passed by reference). | 
| 3235 |                 */ |