It seems like the Java 8 time library supports it: http://stackoverflow.com/questions/14988459/how-do-i-use-julian-day-numbers-with-the-java-calendar-api And perhaps also supported by Jodatime.
Hive seems to use 'jodd': https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/timestamp/NanoTimeUtils.java http://jodd.org/doc/jdatetime.html On Thu, Jan 19, 2017 at 4:34 PM, Dan Burkert <danburk...@apache.org> wrote: > Is there an equivalent library for the JVM? > > - Dan > > On Thu, Jan 19, 2017 at 4:33 PM, Dan Burkert <danburk...@apache.org> > wrote: > > > I think for a long time we resisted vendoring boost, and so avoiding the > > dynamically linked parts of boost was advantageous to avoid > > incompatibilities in system boost versions. I recall we are vendoring > > boost now, so that should be less of a concern, I would think. > > > > - Dan > > > > On Thu, Jan 19, 2017 at 4:16 PM, Todd Lipcon <t...@cloudera.com> wrote: > > > >> Hey folks, > >> > >> I'm starting to look at implementing a 96-bit timestamp type that would > be > >> compatible with Impala and Parquet's TIMESTAMP. Internally, the 96 bits > >> are > >> a 32-bit day number (Julian day) and a 64-bit time on that day > >> (nanoseconds). > >> > >> This maps nicely to the boost::date_time::ptime data type for the > purposes > >> of stringification, etc. Doing manual stringification without using a > >> library is a bit messy, since it has to account for leap years, etc, > when > >> mapping the day number to a year/month/day. > >> > >> Unfortunately, we currently only use boost in a header-only fashion, and > >> it > >> appears the necessary functionality is not header-only. I can't quite > >> recall why we have the header-only restriction - it seems we should be > >> able > >> to static-link boost like any other library. Does anyone have a problem > >> with making that change? Was there some issue that I'm forgetting about? > >> > >> -Todd > >> -- > >> Todd Lipcon > >> Software Engineer, Cloudera > >> > > > > > -- Todd Lipcon Software Engineer, Cloudera
