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https://issues.apache.org/jira/browse/ARROW-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17458338#comment-17458338
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Antoine Pitrou commented on ARROW-602:
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There will be an API and code organization aspect to this.
* API question: there are no typed subclasses for {{ChunkedArray}}, so we need
another solution than simply putting {{begin()}} and {{end()}} methods on
ChunkedArray
* code organization issue: we don't want {{chunked_array.h}} to imply the
inclusion of all type-specific array declarations, so probably need another
solution
My proposal would be to add a generic function {{Iterate<Type>}} in
{{stl_iterator.h}}:
{code:c++}
template <Type>
<some return type> Iterate(const Array&) { ... }
template <Type>
<some return type> Iterate(const ChunkedArray&) { ... }
{code}
Writing the implementation should be reasonably easy.
> [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 Korn
> Priority: Major
> Labels: beginner, good-first-issue, newbie
> Fix For: 7.0.0
>
>
> 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.
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