Log Message:
-----------
Use a cleaner substitute for the inability to apply length() to the tail
of a list. Per private discussion with Neil.
Modified Files:
--------------
pgsql-server/src/backend/optimizer/prep:
prepjointree.c (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/optimizer/prep/prepjointree.c.diff?r1=1.18&r2=1.19)