Technically yes. We only support BIGINT (and all other integers), VARCHAR and UUID for sharding keys, but we'll happily pass through any other data. If we need to process it, we'll need to parse it. To be clear: you can include PostGIS data in all queries, as long as we don't need it for sharding.

It's not too difficult to add sharding on it if we wanted to. For example, we added support for pgvector a while back (L2/IVFlat-based sharding), so we can add any other data type, e.g., POLYGON for sharding on ST_Intersects, or for aggregates.