WordPress at a glance
filter is not described

posts_request_ids filter-hook . WP 3.4.0

Filters the Post IDs SQL request before sending.

Usage

add_filter( 'posts_request_ids', 'filter_function_name_4795', 10, 2 );
function filter_function_name_4795( $request, $this ){
	// filter...

	return $request;
}
$request(string)
The post ID request.
$this(WP_Query)
The WP_Query instance.

Where the hook is called

WP_Query::get_posts()
wp-includes/class-wp-query.php 2819
$this->request = apply_filters( 'posts_request_ids', $this->request, $this );

Where the hook is used (in WP core)

Does not used.