Automattic / jetpack

	function checksum_histogram( $object_type, $buckets, $start_id = null, $end_id = null, $fields = null ) {

		// divide all IDs into the number of buckets

		switch ( $object_type ) {

			case 'posts':

				$posts         = $this->get_posts( null, $start_id, $end_id );

				$all_ids      = array_map( array( $this, 'object_id' ), $posts );

				$id_field      = 'ID';

				$get_function  = 'get_post';

				if ( empty( $fields ) ) {

					$fields = Defaults::$default_post_checksum_columns;

				}

				break;

			case 'post_meta':

				$post_meta = array_filter( $this->meta[ get_current_blog_id() ]['post'], array( $this, 'is_post' ) );

				$all_ids  = array_values( array_map( array( $this, 'meta_id' ), $post_meta ) );

					$fields = Defaults::$default_post_meta_checksum_columns;

				}

				break;

			case 'comments':

				$comments     = $this->get_comments( null, $start_id, $end_id );

				$all_ids  = array_map( array( $this, 'comment_id' ), $comments );

				$id_field     = 'comment_ID';

				$get_function = 'get_comment';

				if ( empty( $fields ) ) {

					$fields = Defaults::$default_comment_checksum_columns;

				}

				break;

			case 'comment_meta':

				$comment_meta = array_filter( $this->meta[ get_current_blog_id() ]['comment'], array( $this, 'is_comment' ) );

				$all_ids  = array_values( array_map( array( $this, 'meta_id' ), $comment_meta ) );