unexpected result for url containing characters "--" in third and fourth position in any domain level

[benjdv]

Examples
`
apache drill> select url_parse('http://www.gooogle.com.uk') /* OK */;
+----------------------------------------------------------------------------------+
| EXPR$0 |
+----------------------------------------------------------------------------------+
| {"scheme":"http","username":"","host":"www.gooogle.com.uk","port":"80","path":"/"} |
+----------------------------------------------------------------------------------+

apache drill> select url_parse('http://www.go--oogle.com.uk') /* NOK */;
+--------+
| EXPR$0 |
+--------+
| {} |
+--------+

apache drill> select url_parse('http://www.g--ooogle.com.uk') /* OK */;
+----------------------------------------------------------------------------------+
| EXPR$0 |
+----------------------------------------------------------------------------------+
| {"scheme":"http","username":"","host":"www.g--ooogle.com.uk","port":"80","path":"/"} |
+----------------------------------------------------------------------------------+

apache drill> select url_parse('http://www.goo--ogle.com.uk') /* OK */;
+----------------------------------------------------------------------------------+
| EXPR$0 |
+----------------------------------------------------------------------------------+
| {"scheme":"http","username":"","host":"www.goo--ogle.com.uk","port":"80","path":"/"} |
+----------------------------------------------------------------------------------+

apache drill> select url_parse('http://www.gooogle.co--m.uk') /* NOK */ ;
+--------+
| EXPR$0 |
+--------+
| {} |
+--------+

apache drill> select url_parse('http://tv--portal.blogspot.de/2011/07/tvn-en-vivo-panama.html') /* NOK */;
+--------+
| EXPR$0 |
+--------+
| {} |
+--------+
`