brancz commented on issue #7988:
URL: https://github.com/apache/arrow-rs/issues/7988#issuecomment-3116741507
Commented on the PR as well, but I didn't realize that this already works,
just not directly from int64 to interval, it first has to go through a duration
nanoseconds.
```
> select arrow_cast(arrow_cast(arrow_cast(100000000, 'Int64'),
'Duration(Nanosecond)'), 'Interval(MonthDayNano)');
+--------------------------------------------------------------------------------------------------------------------------------+
|
arrow_cast(arrow_cast(arrow_cast(Int64(100000000),Utf8("Int64")),Utf8("Duration(Nanosecond)")),Utf8("Interval(MonthDayNano)"))
|
+--------------------------------------------------------------------------------------------------------------------------------+
| 0.100000000 secs
|
+--------------------------------------------------------------------------------------------------------------------------------+
```
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