postgres_fdw aggregate pushdown for group by with expressions

[Michał Kłeczek]

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