Log Message:
-----------
Fix date_trunct for December dates that are in the next year, e.g.:
SELECT date_trunc('week', '2002-12-31'::date);
Backpatch to 8.0.X.
Per report from Nick Johnson.
Modified Files:
--------------
pgsql/src/backend/utils/adt:
timestamp.c (r1.128 -> r1.129)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/timestamp.c.diff?r1=1.128&r2=1.129)