cloud-fan commented on a change in pull request #34494:
URL: https://github.com/apache/spark/pull/34494#discussion_r748031987
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -81,9 +82,13 @@ object Cast {
case (StringType, CalendarIntervalType) => true
case (StringType, _: DayTimeIntervalType) => true
case (StringType, _: YearMonthIntervalType) => true
+ case (_: IntegralType, DayTimeIntervalType(s, e)) if s == e => true
Review comment:
Since we can cast `INTERVAL DAY TO SECOND` to `INTERVAL SECOND`, I think
it's a reasonable and convenient extension to cast `INTERVAL DAY TO SECOND` to
integral type directly. That said, we can allow casting any interval type to
integral type. For casting integral to interval, we should still only allow
single field.
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