Extract quarter from date

Hi, When I run this: SELECT DISTINCT(EXTRACT(QUARTER FROM o_orderdate)) FROM orders;

I get following error: Error: syntax error, unexpected IDENT in: "select distinct(extract(quarter" SQLState: 42000 ErrorCode: 0

Is Quarter not supported or is this a bug? Extract Year, month, day are all working fine.

Environment: RHEL (Amazon Linux), Latest version of MonetDB compiled from source code.

Thanks, Diethard