comphead commented on issue #3664:
URL: https://github.com/apache/arrow-rs/issues/3664#issuecomment-1418249637
```
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,?????????)).unwrap();
```
As I mentioned
https://github.com/apache/arrow-datafusion/issues/5164#issuecomment-1416887886
currently the `cast` function supports one target datatype which includes only
1 timezone info, however input array can have mixed timezones, like in example
above
@viirya @waitingkuo please let me know your thoughts. Probably cast
functions should accept array type `TimestampNanosecondArray` instead of
primitive type `DataType::Timestamp`
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