On Fri, Mar 16, 2012 at 10:17 PM, Tom Lane <t...@sss.pgh.pa.us> wrote: > Shigeru HANADA <shigeru.han...@gmail.com> writes: >> During writing pgsql_fdw codes, I noticed that exprCollation rejects >> non-Expr nodes with error "unrecognized node type: %d". Is this >> intentional behavior, or can it return InvalidOid for unrecognized nodes >> like exprInputCollation? > > Doesn't seem to me that asking for the collation of a list is very > sensible, so I don't see a problem with that.
Oh, I've used the function wrongly. It returns the collation of the result of the expression, so passing a list doesn't make any sense. The comment of expression_tree_walker clearly says that it can handle List as well, so handling List in foreign_expr_walker by calilng itself recursively for each element in the list seems necessary. Regards, -- Shigeru Hanada -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers