[buremba]

You're right but if the syntax that you're using is not supported in Clickhouse, aggregate and predicate pushdowns won't work and this FDW (https://github.com/adjust/clickhouse_fdw) needs to map all the Postgresql functions / produces to Clickhouse in order to take advantage of push-down so the only use-case here is that you may want to join the data in Clickhouse with the data in Postgresql (or other FDW sources).