belugabehr commented on pull request #743:
URL: https://github.com/apache/orc/pull/743#issuecomment-877200933
A quick test (hardly definitive, but indicative) shows an order of magnitude
performance improvement:
```java
long t1 = System.nanoTime();
long r = 0;
for (long i = -100_000L; i < 100_000; i++) {
BigDecimal secondsBd = new BigDecimal(i);
BigDecimal nanosBd = new BigDecimal(i).movePointLeft(9);
BigDecimal resultBd = (i >= 0L) ? secondsBd.add(nanosBd) :
secondsBd.subtract(nanosBd);
r += resultBd.longValue();
}
long t2 = System.nanoTime();
System.out.println(r);
System.out.println(t2 - t1);
```
This can be done even faster by more fully utilizing the Hive
BigDecimalWritable stuff, but this is a good start.
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