Log Message:
-----------
Fix recently added code for SQL years-months interval syntax so that
it behaves correctly for a leading minus sign, zero year value, and
nonzero month value. Per discussion with Ron Mayer.
Modified Files:
--------------
pgsql/src/backend/utils/adt:
datetime.c (r1.195 -> r1.196)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/datetime.c?r1=1.195&r2=1.196)