Re: [JAVA] Contribute to Apache Arrow

2016-07-14 Thread Kiril Menshikov
What should be in the sample application? I think to implement a simple CSV file read and its processing. I looked at the Steven changes they looks good. One thing that came during maven install what “flatc" should be installed. Should we mention in developer docs? Types class have only main m

Re: Timestamps with different precision / Timedeltas

2016-07-14 Thread Alex Samuel
Hi all, May I suggest that instead of fixed-point decimals, you consider a more general fixed-denominator rational representation, for times and other purposes? Powers of ten are convenient for humans, but powers of two more efficient. For some applications, the efficiency of bit operations over d

Re: Timestamps with different precision / Timedeltas

2016-07-14 Thread Uwe Korn
I agree with that having a Decimal type for timestamps is a nice definition. Haying your time encoded as seconds or nanoseconds should be the same as having a scale of the respective amount. But I would rather avoid having a separate decimal physical type. Therefore I'd prefer the parquet appro