JetEngine - Query Results with empty items

code.php

<?php
add_action( 'jet-engine/register-macros', function() { 

	/**
	 * Return purchased products.
	 */
	class Query_Results_Macro_With_Empty_Items extends \Jet_Engine\Query_Builder\Macros\Query_Results_Macro {

		public function macros_tag() {
			return 'query_results_with_empty_items';
		}

		public function macros_name() {
			return esc_html__( 'Query Results (with empty fields)', 'jet-engine' );
		}

		public function macros_callback( $args = array() ) {

			$query_id    = ! empty( $args['query_id'] ) ? $args['query_id'] : false;
			$result_type = ! empty( $args['result_type'] ) ? $args['result_type'] : 'ids';

			if ( ! $query_id ) {
				return array();
			}

			$query = \Jet_Engine\Query_Builder\Manager::instance()->get_query_by_id( $query_id );

			if ( ! $query ) {
				return array();
			}

			$items = $query->get_items();

			if ( empty( $items ) || ! is_array( $items ) ) {
				return false;
			}

			switch ( $result_type ) {
				case 'ids':
					$items = array_map( function( $item ) {
						return jet_engine()->listings->data->get_current_object_id( $item );
					}, $items );
					break;

				case 'selected':

					$result_fields = ! empty( $args['result_fields'] ) ? $args['result_fields'] : '';
					$result_fields = explode( ',', $result_fields );
					
					$items = array_map( function( $item ) use ( $result_fields ) {

						if ( ! $result_fields ) {
							return $item;
						}

						if ( 1 === count( $result_fields ) ) {
							$field = trim( $result_fields[0] );
							return isset( $item->$field ) ? $item->$field : false;
						} else {
							$result = array();
							$item   = get_object_vars( $item );
							foreach ( $result_fields as $field ) {
								$field            = trim( $field );
								$result[ $field ] = isset( $item[ $field ] ) ? $item[ $field ] : false;
							}
						}

						return $result;

					}, $items );

					break;

			}

			return ! empty( $items ) ? $items : false;
		}
	}

	new Query_Results_Macro_With_Empty_Items();  
	
}, 11 );