Log Message:
-----------
Improve plpgsql parsing to report "foo is not a known variable", rather than a
generic syntax error, when seeing "foo := something" and foo isn't recognized.
This buys back most of the helpfulness discarded in my previous patch by not
throwing errors when a qualified name appears to match a row variable but the
last component doesn't match any field of the row. It covers other cases
where our error messages left something to be desired, too.
Modified Files:
--------------
pgsql/src/pl/plpgsql/src:
gram.y (r1.138 -> r1.139)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/pl/plpgsql/src/gram.y?r1=1.138&r2=1.139)