Automattic / jetpack

				}

				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 ) );

				$id_field     = 'meta_id';

				$get_function = 'get_post_meta_by_id';

				if ( empty( $fields ) ) {

					$fields = Defaults::$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 );

					$fields = Defaults::$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 ) );

				$id_field     = 'meta_id';

				$get_function = 'get_comment_meta_by_id';

				if ( empty( $fields ) ) {

					$fields = Defaults::$default_comment_meta_checksum_columns;

				}

				break;

			default:

				return false;

		}