WordPress query object keys

WP_Query Object ( [query_vars] => Array ( [showposts] =>  [cat] =>  [meta_key] =>  [error] => [m] => 0 [p] => 0 [post_parent] => [subpost] => [subpost_id] => [attachment] => [attachment_id] => 0 [name] => [static] => [pagename] => [page_id] => 0 [second] => [minute] => [hour] => [day] => 0 [monthnum] => 0 [year] => 0 [w] => 0 [category_name] => [tag] => [tag_id] => 0 [author_name] => [feed] => [tb] => [paged] => 0 [comments_popup] => [meta_value] => [preview] => [s] => [sentence] => [category__in] => Array ( [0] => 3 ) [category__not_in] => Array ( ) [category__and] => Array ( ) [post__in] => Array ( ) [post__not_in] => Array ( ) [tag__in] => Array ( ) [tag__not_in] => Array ( ) [tag__and] => Array ( ) [tag_slug__in] => Array ( ) [tag_slug__and] => Array ( ) [caller_get_posts] => [suppress_filters] => [cache_results] => 1 [update_post_term_cache] => 1 [update_post_meta_cache] => 1 [post_type] => [posts_per_page] => 2 [nopaging] => [comments_per_page] => 50 [no_found_rows] => [order] => DESC [orderby] => wp_posts.post_date DESC ) [request] => SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_term_taxonomy ON (wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id) JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) WHERE 1=1 AND wp_term_taxonomy.taxonomy = ‘category’ AND wp_term_taxonomy.term_id IN (’3′) AND wp_posts.post_type = ‘post’ AND (wp_posts.post_status = ‘publish’ OR wp_posts.post_status = ‘private’)  GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC LIMIT 0, 2 [post_count] => 0 [current_post] => -1 [in_the_loop] => [post] => [comments] => [comment_count] => 0 [current_comment] => -1 [comment] => [found_posts] => 0 [max_num_pages] => 0 [max_num_comment_pages] => 0 [is_single] => [is_preview] => [is_page] => [is_archive] => 1 [is_date] => [is_year] => [is_month] => [is_day] => [is_time] => [is_author] => [is_category] => 1 [is_tag] => [is_tax] => [is_search] => [is_feed] => [is_comment_feed] => [is_trackback] => [is_home] => [is_404] => [is_comments_popup] => [is_admin] => [is_attachment] => [is_singular] => [is_robots] => [is_posts_page] => [is_paged] => [query] => showposts=2&cat=3 [posts] => Array ( ) )