[Maria-discuss] Group by pushdown for JDBC or FederatedX

Hi! I'm evaluating if I can use Maria's JDBC connector to join tables from Apache Pinot (they have a prototype jdbc connector). When external tables are used (like JDBC or FederatedX), are group bys pushed down or do these connectors return the raw rows to Maria? I see comments about lack of filter pushdowns for FederatedX. I wouldn't the raw level data coming back from Pinot (there are too many rows to be performant). Thanks! - Dan