Re: [PATCH] Implement (and document, and test) has_sequence_privilege()

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In response to:
http://archives.postgresql.org/message-id/1238394513-21474-1-git-send-email-ams@oryx.com

Review complete. Somewhat modified patch attached. I wasn't happy with
creation of verify_sequence_oid() when it more-or-less duplicates the
functionality of get_rel_relkind(). Also, the original patch was
misleading in that the following comment:

+ * The result is a boolean value: true if user has the indicated
+ * privilege, false if not. The variants that take a relation OID
+ * return NULL if the OID doesn't exist (rather than failing, as
+ * they did before Postgres 8.4).

implies that the relname variants should throw an ERROR for non-existing
names (which they in fact do), but the code for these functions reads, e.g.:

+Datum
+has_sequence_privilege_name_name(PG_FUNCTION_ARGS)
+{
+ Name rolename = PG_GETARG_NAME(0);
+ text *sequencename = PG_GETARG_TEXT_P(1);
<snip>
+ sequenceoid = convert_table_name(sequencename);
+ if (!verify_sequence_oid(sequenceoid))
+ PG_RETURN_NULL();

Here, verify_sequence_oid() is never called for a non-existing relname,
because the call to convert_table_name() will throw an ERROR first. And
verify_sequence_oid() will throw an ERROR if the relation is not a
sequence. Therefore verify_sequence_oid() will only return if TRUE, and
PG_RETURN_NULL() is never reached. But if it were able to be reached, it
would be in conflict with the comment.

If there are no objections, I'll commit in a day or two.

Joe
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