Investigate how to add support for timezones in timestamp

[jorgecarleitao]

We currently support timezones at logical level, via Timestamp(_, tz), but have no mechanism to perform operations with them, The goal is to investigate how to add support for them. This will likely require depending on chrono-tz.

A simple concrete goal here is to add support to cast from and to Timestamp(_, str) and Timestamp(_, None).

A question here is how we represent these things: it seems that in chrono-tz, timezones are static types (i.e. struct), while timezones in Arrow are dynamic (i.e. str).

[elferherrera]

What happened to this one? Did you managed to get timezones working?

[jorgecarleitao]

There has been some discussions over the mailing list on how timezones should be treated, so I have not touched this. It seems that they have settled, though.

[elferherrera]

I didnt follow the mailing list, sorry. What was the final solution at the end?

[jorgecarleitao]

@elferherrera , being done in #376 . Took a bit to understand what was that about. It would be great if you could take a look.