Log Message:-----------Fix mistaken Assert in adjust_appendrel_attr_needed, per Greg Stark.
Modified Files:-------------- pgsql/src/backend/optimizer/prep: prepunion.c (r1.142 -> r1.143) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepunion.c.diff?r1=1.142&r2=1.143)
