BP_Notifications_Notification::get_meta_query_sql( array $meta_query = array() )

	public static function get_meta_query_sql( $meta_query = array() ) {

		// Default array keys & empty values.
		$sql_array = array(
			'join'  => '',
			'where' => '',
		);

		// Bail if no meta query.
		if ( empty( $meta_query ) ) {
			return $sql_array;
		}

		// WP_Meta_Query expects the table name at $wpdb->notificationmeta.
		$GLOBALS['wpdb']->notificationmeta = buddypress()->notifications->table_name_meta;

		$n_meta_query = new WP_Meta_Query( $meta_query );
		$meta_sql     = $n_meta_query->get_sql( 'notification', 'n', 'id' );

		// Strip the leading AND - it's handled in get().
		$sql_array['where'] = preg_replace( '/^\sAND/', '', $meta_sql['where'] );
		$sql_array['join']  = $meta_sql['join'];

		return $sql_array;
	}