presto-main/src/main/java/io/prestosql/operator/PagesSpatialIndexSupplier.java/PagesSpatialIndexSupplier/computeMemorySizeInBytes
class PagesSpatialIndexSupplier:    private long computeMemorySizeInBytes(ItemBoundable item)
    {
        return ENVELOPE_INSTANCE_SIZE + ((GeometryWithPosition) item.getItem()).getEstimatedMemorySizeInBytes();
    }