alamb commented on code in PR #4020:
URL: https://github.com/apache/arrow-rs/pull/4020#discussion_r1167251885
##########
arrow-cast/src/cast.rs:
##########
@@ -8246,4 +8385,137 @@ mod tests {
);
assert_eq!("Invalid argument error: 1234567000 is too large to store
in a Decimal256 of precision 7. Max is 9999999", err.unwrap_err().to_string());
}
+
+ #[test]
+ fn test_cast_from_duration_to_interval() {
+ // from duration second to interval month day nano
+ let array = vec![1234567];
+ let array = DurationSecondArray::from(array);
+ let array = Arc::new(array) as ArrayRef;
+ let casted_array =
+ cast(&array,
&DataType::Interval(IntervalUnit::MonthDayNano)).unwrap();
+ let casted_array = casted_array
+ .as_any()
+ .downcast_ref::<IntervalMonthDayNanoArray>()
+ .unwrap();
+ assert_eq!(
+ casted_array.data_type(),
+ &DataType::Interval(IntervalUnit::MonthDayNano)
+ );
+ assert_eq!(casted_array.value(0), 1234567000000000);
+
+ // from duration millisecond to interval month day nano
+ let array = vec![1234567];
+ let array = DurationMillisecondArray::from(array);
+ let array = Arc::new(array) as ArrayRef;
+ let casted_array =
+ cast(&array,
&DataType::Interval(IntervalUnit::MonthDayNano)).unwrap();
+ let casted_array = casted_array
+ .as_any()
+ .downcast_ref::<IntervalMonthDayNanoArray>()
+ .unwrap();
+ assert_eq!(
+ casted_array.data_type(),
+ &DataType::Interval(IntervalUnit::MonthDayNano)
+ );
+ assert_eq!(casted_array.value(0), 1234567000000);
+
+ // from duration microsecond to interval month day nano
+ let array = vec![1234567];
+ let array = DurationMicrosecondArray::from(array);
+ let array = Arc::new(array) as ArrayRef;
+ let casted_array =
+ cast(&array,
&DataType::Interval(IntervalUnit::MonthDayNano)).unwrap();
+ let casted_array = casted_array
+ .as_any()
+ .downcast_ref::<IntervalMonthDayNanoArray>()
+ .unwrap();
+ assert_eq!(
+ casted_array.data_type(),
+ &DataType::Interval(IntervalUnit::MonthDayNano)
+ );
+ assert_eq!(casted_array.value(0), 1234567000);
+
+ // from duration nanosecond to interval month day nano
+ let array = vec![1234567];
+ let array = DurationNanosecondArray::from(array);
+ let array = Arc::new(array) as ArrayRef;
+ let casted_array =
+ cast(&array,
&DataType::Interval(IntervalUnit::MonthDayNano)).unwrap();
+ let casted_array = casted_array
+ .as_any()
+ .downcast_ref::<IntervalMonthDayNanoArray>()
+ .unwrap();
+ assert_eq!(
+ casted_array.data_type(),
+ &DataType::Interval(IntervalUnit::MonthDayNano)
+ );
+ assert_eq!(casted_array.value(0), 1234567);
+ }
+
+ #[test]
+ fn test_cast_from_interval_to_duration() {
+ // from interval month day nano to duration second
+ let array = vec![1234567];
+ let array = IntervalMonthDayNanoArray::from(array);
+ let array = Arc::new(array) as ArrayRef;
+ let casted_array = cast(&array,
&DataType::Duration(TimeUnit::Second)).unwrap();
+ let casted_array = casted_array
+ .as_any()
+ .downcast_ref::<DurationSecondArray>()
+ .unwrap();
+
+ assert_eq!(
+ casted_array.data_type(),
+ &DataType::Duration(TimeUnit::Second)
+ );
+ assert_eq!(casted_array.value(0), 0);
+
+ // from interval month day nano to duration millisecond
+ let array = vec![1234567];
Review Comment:
You could probably refactor this repetition into a function and avoid so
much boiler plate in the tests
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