presto-main/src/main/java/io/prestosql/type/setdigest/BuildSetDigestAggregation.java/BuildSetDigestAggregation/input
class BuildSetDigestAggregation:    @InputFunction
    public static void input(SetDigestState state, @SqlType(StandardTypes.BIGINT) long value)
    {
        if (state.getDigest() == null) {
            state.setDigest(new SetDigest());
        }
        state.getDigest().add(value);
    }