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https://issues.apache.org/jira/browse/ARROW-17257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17574061#comment-17574061
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Aldrin Montana commented on ARROW-17257:
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I was trying to figure out how to access fields of nested data types for
ARROW-8991. For *StructArray*, it looks like *data_->child_data* is a
straightforward
approach([array_nested.cc#L579|https://github.com/apache/arrow/blob/53752adc6b81166cd4ee7db5a819494042f29197/cpp/src/arrow/array/array_nested.cc#L579]).
However, the most visible solutions are to access *ArraySpan* buffers
manually, or to take the performance hit to call *ArraySpan::ToArray()*. I
suspect it is possible to use
[visit_data_inline.h|https://github.com/apache/arrow/blob/master/cpp/src/arrow/visit_data_inline.h],
but I'm not yet sure how.
I guess all this to say that it would be cool if, as part of this effort,
higher level interfaces such as StructArray are able to provide re-usable
functions, or leverage them, for accessing elements in either *ArraySpan* or
*KeyColumnArray*. And, if I can help I would be happy to.
> [C++] Unify KeyColumnArray and ArraySpan
> ----------------------------------------
>
> Key: ARROW-17257
> URL: https://issues.apache.org/jira/browse/ARROW-17257
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Weston Pace
> Priority: Major
>
> Both of these are essentially non-owning views into ArrayData. They were
> developed somewhat independently but share a pretty similar structure. I
> don't think we need both and we should unify on a common type for simplicity
> provided we can show no real performance difference.
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