This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

WP_Comment_Query::set_found_comments()

Populates found_comments and max_num_pages properties for the current query if the limit clause was used.

Source

File: wp-includes/class-wp-comment-query.php 

	private function set_found_comments() {
		global $wpdb;

		if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
			/**
			 * Filters the query used to retrieve found comment count.
			 *
			 * @since WP-4.4.0
			 *
			 * @param string           $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'.
			 * @param WP_Comment_Query $comment_query        The `WP_Comment_Query` instance.
			 */
			$found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this );

			$this->found_comments = (int) $wpdb->get_var( $found_comments_query );
		}
	}

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Related

Uses

Uses
Uses Description
wp-includes/wp-db.php: wpdb::get_var()

Retrieve one variable from the database.
wp-includes/plugin.php: apply_filters()

Call the functions added to a filter hook.
wp-includes/class-wp-comment-query.php: found_comments_query

Filters the query used to retrieve found comment count.

Changelog

Changelog
Version Description
WP-4.6.0 Introduced.