Log Message:
-----------
Improve C comment about why we return "0 0" for some tags.
Modified Files:
--------------
pgsql/src/backend/tcop:
pquery.c (r1.134 -> r1.135)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/pquery.c?r1=1.134&r2=1.135)