Answer / guest

Cause: A fine grain access control procedure has applied a
non-null policy to the query for the materialized view.

Action: In order for the materialized view to work
correctly, any fine grain access control procedure in effect
for the query must return a null policy when the
materialized view is being created or refreshed. This may be
done by ensuring that the usernames for the creator, owner,
and invoker of refresh procedures for the materialized view
all receive a null policy by the user-written fine grain
access control procedures.

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