WordPress at a glance
filter is not described

the_comments filter-hook . WP 3.1.0

Filters the comment query results.

Usage

add_filter( 'the_comments', 'filter_function_name_3230', 10, 2 );
function filter_function_name_3230( $_comments, $this ){
	// filter...

	return $_comments;
}
$_comments(array)
An array of comments.
$this(WP_Comment_Query)
Current instance of WP_Comment_Query (passed by reference).

Where the hook is called

WP_Comment_Query::get_comments()
wp-includes/class-wp-comment-query.php 455
$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );

Where the hook is used (in WP core)

Does not used.