stevomitric commented on code in PR #57680:
URL: https://github.com/apache/spark/pull/57680#discussion_r3749705105
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sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/DateExpressionsSuite.scala:
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@@ -2407,6 +2407,91 @@ class DateExpressionsSuite extends SparkFunSuite with
ExpressionEvalHelper {
}
}
+ test("SPARK-57832: subtract nanosecond-precision timestamps") {
+ // The difference between two nanosecond timestamps is reported on the
microsecond grid: only
+ // each operand's epochMicros participates, so the sub-microsecond
remainder is truncated. The
+ // two operands below share the same wall clock down to the microsecond
and differ only within
Review Comment:
Rewrote so the first pair explains the day+0.123456s case and points
(different days, .123456 vs .000000) to the second pair for the zero result
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