[jira] [Updated] (ARROW-1734) C++/Python: Add cast function on Column-level

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney updated ARROW-1734:
--------------------------------
    Fix Version/s: 0.8.0

> C++/Python: Add cast function on Column-level
> ---------------------------------------------
>
>                 Key: ARROW-1734
>                 URL: https://issues.apache.org/jira/browse/ARROW-1734
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++, Python
>            Reporter: Uwe L. Korn
>            Assignee: Uwe L. Korn
>             Fix For: 0.8.0
>
>
> Add a {{Cast}} function on a column level that casts all underlying arrays.
> There are three possible options we could implement:
>  * Make a special cast implementation that takes a ChunkedArray and returns a simple Array
>  * Make a universal implementation that takes a ChunkedArray and applies a Kernel on each Array, returning a ChunkedArray with the same chunking
>  * Make a universal implementation that takes a ChunkedArray and applies a Kernel on each Array, returning a plain Array with no chunking



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