presto-spi/src/main/java/io/prestosql/spi/type/TimestampWithTimeZoneType.java/TimestampWithTimeZoneType/compareTo
class TimestampWithTimeZoneType:    @Override
    public int compareTo(Block leftBlock, int leftPosition, Block rightBlock, int rightPosition)
    {
        long leftValue = unpackMillisUtc(leftBlock.getLong(leftPosition, 0));
        long rightValue = unpackMillisUtc(rightBlock.getLong(rightPosition, 0));
        return Long.compare(leftValue, rightValue);
    }