presto-geospatial/src/main/java/io/prestosql/plugin/geospatial/aggregation/GeometryStateSerializer.java/GeometryStateSerializer/deserialize
class GeometryStateSerializer:    @Override
    public void deserialize(Block block, int index, GeometryState state)
    {
        state.setGeometry(GeometrySerde.deserialize(GEOMETRY.getSlice(block, index)));
    }