Possible bug acldefault function

Hi Team,

I came across an issue while working with acldefault function on materialized view, which threw an error "ERROR: unrecognized objtype abbreviation: m", when I looked at the source code of acldefault_sql it seems that materialized view case is not handled there, the SQL statement which I was executing is as follows,

`select relname, relowner, acldefault(relkind, relowner) as acl from pg_class where relkind in ('r', 'p', 'v', 'm');`

Please note that the value of relacl column in pg_class is NULL, upon assigning the permission explicitly the error goes away.

I'm not sure if it is truly a bug or I have some misunderstanding about the function.

Your guidance will be helpful to get better understanding of the issue.

Thank you.

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