class-shared-counts-admin.php

<?php

	/**
	 * Sort Column Query.
	 *
	 * @since 1.1.0
	 *
	 * @param object $query WP_Query object.
	 */
	public function sort_column_query( $query ) {

		if ( is_admin() && 'shared_counts' === $query->get( 'orderby' ) ) {
			$meta_query = array(
				'relation' => 'OR',
				array(
					'key' => 'shared_counts_total',
					'type' => 'NUMERIC',
					'compare' => 'EXISTS',
				),
				array(
					'key' => 'shared_counts_total',
					'type' => 'NUMERIC',
					'compare' => 'NOT EXISTS',
				)
			);
			$query->set( 'orderby', 'meta_value_num date' );
			$query->set( 'meta_query', $meta_query );
		}
	}