[
https://issues.apache.org/jira/browse/ARROW-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738172#comment-16738172
]
Antoine Pitrou commented on ARROW-602:
--------------------------------------
We have {{ArrayDataVisitor}} now that will tackle many of the use cases of
iterator access (though with inversion of control, so you have to define a
visitor class which may feel like boilerplate).
The nice thing with the inversion of control is that we may for example
optimize {{ArrayDataVisitor}} by unrolling the null bitmap reading loop 8 times.
> 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
> Priority: Major
> 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
(v7.6.3#76005)
