postgres_fdw aggregate pushdown for group by with expressions

Hi,

I have the following foreign table:

CREATE FOREIGN TABLE t1 (
grouping_column text,
date_column date,
whatever_data int
);

The query is:

SELECT
sum(whatever_data)
FROM
t1
GROUP BY
grouping_colulmn, extract(YEAR FROM date_column), extract(MONTH FROM date_column);

From my (preliminary) testing postgres_fdw will not push down this aggregate query
- it will happily push down query with only “grouping_column” or “grouping_column, date_column" in GROUP BY

Is there a way to somehow push down the query with expressions in GROUP BY?

Thanks,
Michal