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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 | 
|---|---|
| 3286 |           /** | 
| 3287 |            * Fires to announce the query's current selection parameters. | 
| 3288 |            * | 
| 3289 |            * For use by caching plugins. | 
| 3290 |            * | 
| 3291 |            * @since 2.3.0 | 
| 3292 |            * | 
| 3293 |            * @param string $selection The assembled selection query. | 
| 3294 |            */ | 
| 3295 |           do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); | 
| 3296 |  | 
| 3297 |           /* | 
| 3298 |            * Filter again for the benefit of caching plugins. | 
| 3299 |            * Regular plugins should use the hooks above. | 
| 3300 |            */ | 
| 3301 |           if ( !$q['suppress_filters'] ) { | 
| 3302 |                /** | 
| 3303 |                 * Filter the WHERE clause of the query. | 
| 3304 |                 * |