presto-rcfile/src/main/java/io/prestosql/rcfile/binary/TimestampEncoding.java/TimestampEncoding/decodeValueInto
class TimestampEncoding:    @Override
    public void decodeValueInto(BlockBuilder builder, Slice slice, int offset, int length)
    {
        long millis = getTimestamp(slice, offset);
        type.writeLong(builder, millis);
    }