WordPress at a glance
filter is not described

getarchives_join filter-hook . WP 2.2.0

Filters the SQL JOIN clause for retrieving archives.

Usage

add_filter( 'getarchives_join', 'filter_function_name_9504', 10, 2 );
function filter_function_name_9504( $sql_join, $r ){
	// filter...

	return $sql_join;
}
$sql_join(string)
Portion of SQL query containing JOIN clause.
$r(array)
An array of default arguments.

Where the hook is called

wp_get_archives()
wp-includes/general-template.php 1759
$join = apply_filters( 'getarchives_join', '', $r );

Where the hook is used (in WP core)

Does not used.