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function my_posts_request_filter($input)
{
print_r($input);
}
add_filter('posts_request','my_posts_request_filter');
The input of this filter is the post request SQL, something like the following:
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts LEFT JOIN wp_posts AS p2 ON (wp_posts.post_parent = p2.ID) WHERE 1=1 AND wp_posts.ID IN (3, 632) AND wp_posts.post_type != 'revision' AND ((wp_posts.post_status = 'publish') OR (wp_posts.post_status = 'inherit' AND (p2.post_status = 'publish'))) ORDER BY wp_posts.post_date DESC LIMIT 0, 20