tustvold commented on issue #3664:
URL: https://github.com/apache/arrow-rs/issues/3664#issuecomment-1418788640
> however input array can have mixed timezones,
My naive expectation in such a case is that it would cast the timestamps to
the provided output timezone. So in your example
```
let valid = StringArray::from(vec![
"2023-01-01 04:05:06.789-8",
"2023-01-01 04:05:06.789-7",
]);
let array = Arc::new(valid) as ArrayRef;
let b = cast(&array, &DataType::Timestamp(TimeUnit::Nanosecond,
Some("+02:00".to_string()))).unwrap();
```
Would result in
```
"2023-01-01 14:05:06.789+2"
"2023-01-01 13:05:06.789+2"
```
Or to put it differently, each row would be parsed with any FixedOffset
specific to that row, and it would then be converted to the output timezone
> Probably cast functions should accept array type TimestampNanosecondArray
instead of primitive type DataType::Timestamp
I don't follow what you mean by this
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