Automattic\WooCommerce\Admin\API

Products::add_wp_query_fields │ public static │ WC 1.0

Add in conditional select fields to the query.

Method of the class: Products{}

No Hooks.

Returns

String.

Usage

$result = Products::add_wp_query_fields( $select, $wp_query );
$select(string) (required)
Select clause used to select fields from the query.
$wp_query(object) (required)
WP_Query object.

Products::add_wp_query_fields() code WC 10.4.3

woocommerce/src/Admin/API/Products.php 
public static function add_wp_query_fields( $select, $wp_query ) {
	if ( $wp_query->get( 'low_in_stock' ) ) {
		$fields  = array(
			'low_stock_amount_meta.meta_value AS low_stock_amount',
			'MAX( product_lookup.date_created ) AS last_order_date',
		);
		$select .= ', ' . implode( ', ', $fields );
	}

	return $select;
}