Log Message:
-----------
Forbid renaming columns of objects whose column names are system-generated.
KaiGai Kohei, with adjustments to the comments.
Modified Files:
--------------
pgsql/src/backend/commands:
tablecmds.c (r1.328 -> r1.329)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/tablecmds.c?r1=1.328&r2=1.329)