MaxGekk commented on a change in pull request #32839:
URL: https://github.com/apache/spark/pull/32839#discussion_r648300427



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
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@@ -385,9 +385,16 @@ object DateTimeUtils {
    * microseconds where microsecond 0 is 1970-01-01 00:00:00Z.
    */
   def instantToMicros(instant: Instant): Long = {
-    val us = Math.multiplyExact(instant.getEpochSecond, MICROS_PER_SECOND)
-    val result = Math.addExact(us, NANOSECONDS.toMicros(instant.getNano))
-    result
+    val secs = instant.getEpochSecond
+    if (secs == Math.floorDiv(Long.MinValue, MICROS_PER_SECOND)) {
+      val us = Math.multiplyExact(secs + 1, MICROS_PER_SECOND)
+      val result = Math.addExact(us, NANOSECONDS.toMicros(instant.getNano) - 
MICROS_PER_SECOND)

Review comment:
       Are you making some assumption about `instant.getNano`? See the assert 
the code for intervals:
   
https://github.com/apache/spark/blob/2c8ced95905b8a9f7b98c4913a385d25da455e7a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/IntervalUtils.scala#L877-L879
   Should we have similar assert here?




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