Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6733#discussion_r32075891
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateUtils.scala
---
@@ -87,4 +88,33 @@ object DateUtils {
ISO8601GMT.parse(s)
}
}
+
+ /**
+ * Return a java.sql.Timestamp from number of 100ns since epoch
+ */
+ def toTimestamp(ns: Long): Timestamp = {
+ // setNanos() will overwrite the millisecond part, so the milliseconds
should be
+ // cut off at seconds
+ var seconds = ns / HUNDRED_NANOS_PER_SECOND
+ var nanos = ns % HUNDRED_NANOS_PER_SECOND
+ // setNanos() can not accept negative value
+ if (nanos < 0) {
+ nanos += HUNDRED_NANOS_PER_SECOND
+ seconds -= 1
+ }
+ val t = new Timestamp(seconds * 1000)
+ t.setNanos(nanos.toInt * 100)
+ t
+ }
+
+ /**
+ * Return the number of 100ns since epoch from java.sql.Timestamp.
+ */
+ def fromTimestamp(t: Timestamp): Long = {
+ if (t != null) {
+ t.getTime() * 10000L + (t.getNanos().toLong / 100) % 10000L
--- End diff --
let's add unit test for this file. it is too scary.
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