nootron on "WP 3.0.1 export by category bugged"

I think I found a bug and was hoping to get some feedback and/or help.

Specifically, when exporting posts by category in WP 3.0 and above, I am getting an export file that does not match the known contents of a particular category.

I snooped around and found this code block:

if ( $taxonomy && is_array( $taxonomy ) ) {
		foreach ( $taxonomy as $term_id ) {
			if ( $term_id != 'all' )
				$where .= $wpdb->prepare( "AND ID IN (SELECT object_id FROM $wpdb->term_relationships WHERE term_taxonomy_id = %d) ", $term_id );
		}
	}

This code chunk is from wp-admin/includes/export.php and is used when exporting content in WordPress 3.0 and above. It seems to be matching posts based on an incorrect WHERE clause. The clause needs to select term_id, not term_taxonomy_id. As term_id is not available in the term_relationships table, a JOIN is needed as well.

A revised SQL query:

SELECT object_id FROM $wpdb->term_relationships
JOIN $wpdb->term_taxonomy ON $wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id
WHERE $wpdb->term_taxonomy.term_id = %d