izveigor opened a new issue, #4181:
URL: https://github.com/apache/arrow-rs/issues/4181
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
`arrow-rs` now does not support cast between `Intervals`.
This can cause difficulties when working with dissimilar intervals.
The example of code:
```
use arrow::array::*;
use arrow_cast::cast;
use arrow_schema::DataType;
use std::sync::Arc;
use arrow::datatypes::{IntervalUnit, IntervalYearMonthType};
fn main() {
let a = IntervalYearMonthArray::from(vec![
IntervalYearMonthType::make_value(1, 1),
IntervalYearMonthType::make_value(2, 2),
IntervalYearMonthType::make_value(3, 3),
]);
let array = Arc::new(a) as ArrayRef;
let b = cast(&array,
&DataType::Interval(IntervalUnit::MonthDayNano)).unwrap();
let c = b.as_any().downcast_ref::<IntervalMonthDayNanoArray>().unwrap();
println!("{:#?}", c); // Casting from Interval(YearMonth) to
Interval(MonthDayNano) not supported
}
```
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**Describe the solution you'd like**
Add the ability for the function to process the following inputs:
`Interval(IntervalUnit::YearMonth)` -> `Interval(IntervalUnit::MonthDayNano)`
`Interval(IntervalUnit::DayTime)` -> `Interval(IntervalUnit::MonthDayNano)`
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