[jira] [Commented] (ARROW-602) C++: Provide iterator access to primitive elements inside a Column/ChunkedArray

["Johan Mabille (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15929943#comment-15929943 ] 

Johan Mabille commented on ARROW-602:
-------------------------------------

The problem is a C++ iterator assumes that all the elements of the underlying container have the same type, whereas it may not be the case for elements in a ChunkedArray. I couldn't find the specification of ChunkedArray, but I guess you don't want to force the chunks to have the same value type ?

> C++: Provide iterator access to primitive elements inside a Column/ChunkedArray
> -------------------------------------------------------------------------------
>
>                 Key: ARROW-602
>                 URL: https://issues.apache.org/jira/browse/ARROW-602
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Uwe L. Korn
>              Labels: beginner, newbie
>
> Given a ChunkedArray, an Arrow user must currently iterate over all its chunks and then cast them to their types to extract the primitive memory regions to access the values. A convenient way to access the underlying values would be to offer a function that takes a ChunkedArray and returns a C++ iterator over all elements.
> While this may not be the most performant way to access the underlying data, it should have sufficient performance and adds a convenience layer for new users.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)