presto-main/src/main/java/io/prestosql/type/setdigest/SetDigestStateSerializer.java/SetDigestStateSerializer/deserialize
class SetDigestStateSerializer:    @Override
    public void deserialize(Block block, int index, SetDigestState state)
    {
        state.setDigest(SetDigest.newInstance(block.getSlice(index, 0, block.getSliceLength(index))));
    }