Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6759#discussion_r32856533
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -117,4 +124,27 @@ object DateUtils {
0L
}
}
+
+ /**
+ * Return the number of 100ns (hundred of nanoseconds) since epoch from
julian day
+ * and nanoseconds in a day
+ */
+ def fromJulianDay(day: Int, nanoseconds: Long): Long = {
+ // use integer to avoid rounding errors
+ val seconds = (day - JULIAN_DAY_OF_EPOCH).toLong * SECONDS_PER_DAY -
SECONDS_PER_DAY / 2
+ seconds * HUNDRED_NANOS_PER_SECOND + nanoseconds / 100L
+ }
+
+ /**
+ * Return julian day and nanoseconds in a day from the number of 100ns
(hundred of nanoseconds)
+ * @param num100ns
--- End diff --
If we're not going to document these Scaladoc parameters, then I think we
should leave them out, since it looks a bit messy in my IDE.
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