presto-main/src/main/java/io/prestosql/type/setdigest/SetDigest.java/SetDigest/estimatedSerializedSize
class SetDigest:    public int estimatedSerializedSize()
    {
        return SIZE_OF_BYTE + SIZE_OF_INT + hll.estimatedSerializedSize() + 2 * SIZE_OF_INT + minhash.size() * SIZE_OF_ENTRY;
    }