waitingkuo commented on PR #6832:
URL:
https://github.com/apache/arrow-datafusion/pull/6832#issuecomment-1642595688
@berkaysynnada @tustvold @alamb
currently we couldn't covert interval back to duration if it contains mons
or days
```bash
❯ select arrow_cast(interval '1 day', 'Duration(Nanosecond)');
Optimizer rule 'simplify_expressions' failed
caused by
Arrow error: Compute error: Cannot cast to Duration(Nanosecond). Overflowing
on 18446744073709551616
```
however pure nanos representation works
```bash
❯ select arrow_cast(interval '24 hours', 'Duration(Nanosecond)');
+----------------------------------------+
| IntervalMonthDayNano("86400000000000") |
+----------------------------------------+
| P1D |
+----------------------------------------+
1 row in set. Query took 0.002 seconds.
```
it make sense to raise error while converting month unit, but for days
should we fix it?
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