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Posted to github@arrow.apache.org by "parthchandra (via GitHub)" <gi...@apache.org> on 2023/05/04 23:55:12 UTC
[GitHub] [arrow-rs] parthchandra opened a new issue, #4168: Allow cast to take in a format specification
parthchandra opened a new issue, #4168:
URL: https://github.com/apache/arrow-rs/issues/4168
The [`cast` function](https://github.com/apache/arrow-rs/blob/c4ac758e13cbd76651d16d06e786bdf7c04f902a/arrow-cast/src/cast.rs#L336) supports cast to string types (Utf8, LargeUtf8). This in turn uses formatting capabilities from [display](https://github.com/apache/arrow-rs/blob/master/arrow-cast/src/display.rs). While the formatter itself allows format options to be specified, cast always uses the default format options.
It would be useful if the cast function also allowed formatting options to be passed in. This is useful where an engine using the `cast` function may want the output in a format different from the default.
An example is with timestamps - the default formatting is per `rfc3339` and displays `1997-05-19T00:00:03.05`. A different engine might want to display `1997-05-19 00:00:03.050` (For instance that is how Apache Spark casts timestamp to string).
**Describe the solution you'd like**
Allow cast to accept format options.
**Describe alternatives you've considered**
There is no other way. The option is hard coded, so the only thing a caller can do is to run some string conversion on the returned values.
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[GitHub] [arrow-rs] tustvold commented on issue #4168: Allow cast to take in a format specification
Posted by "tustvold (via GitHub)" <gi...@apache.org>.
tustvold commented on issue #4168:
URL: https://github.com/apache/arrow-rs/issues/4168#issuecomment-1552715999
`label_issue.py` automatically added labels {'arrow'} from #4169
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[GitHub] [arrow-rs] tustvold closed issue #4168: Allow cast to take in a format specification
Posted by "tustvold (via GitHub)" <gi...@apache.org>.
tustvold closed issue #4168: Allow cast to take in a format specification
URL: https://github.com/apache/arrow-rs/issues/4168
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