[jira] [Commented] (ARROW-1888) [C++] Implement casts from one struct type to another (with same field names and number of fields)

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320031#comment-17320031 ] 

Joris Van den Bossche commented on ARROW-1888:
----------------------------------------------

Small example of what could be supported:

{code:python}
>>> arr = pa.array([{'a': 1, 'b': None}, {'a': 2, 'b': None}])
>>> arr.type
StructType(struct<a: int64, b: null>)

>>> arr.cast(pa.struct([('a', pa.int64()), ('b', pa.int64())]))
...
ArrowNotImplementedError: Unsupported cast from struct<a: int64, b: null> to struct using function cast_struct
../src/arrow/compute/function.cc:175  DispatchBest(&inputs)
{code}


> [C++] Implement casts from one struct type to another (with same field names and number of fields)
> --------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-1888
>                 URL: https://issues.apache.org/jira/browse/ARROW-1888
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: analytics
>




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