comphead commented on issue #5164:
URL:
https://github.com/apache/arrow-datafusion/issues/5164#issuecomment-1416887886
@alamb @waitingkuo likely we have some design issues on TimestampTz
please consider such simple case
```
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();
```
Ive put **????????** as its not really clear what has to be there,
`Some("+07:00")` or `Some("+08:00")`? cast works for array which can contain
mixed timezones, however the output datatype is a single value with only 1
supported tz
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