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https://issues.apache.org/jira/browse/ARROW-602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15934712#comment-15934712
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Johan Mabille edited comment on ARROW-602 at 3/21/17 2:32 PM:
--------------------------------------------------------------
I thought I would add this interface to numerical arrays for a start, but I
agree it might be complicated to go back if we experience any problem in adding
this interface to the other array classes in the future.
By the way I guess your first question is adressing the handling of missing
values ? Sylvain has done some work on it for xtensor, you might be interested
in [https://github.com/QuantStack/xtensor/pull/196].
More generally, what would be the best process for you? I can open a dedicated
issue for this topic, so that we can identify all the possible problems and
start trying to solve them. Or I can start a draft and we can iterate (or maybe
you already started something I can contribute to). I guess this document could
go into arrow/cpp/doc, so I may open a PR with an initial draft.
was (Author: johanmabille):
I thought I would add this interface to numerical arrays for a start, but I
agree it might be complicated to go back if we experience any problem in adding
this interface to the other array classes in the future.
By the way I guess your first question is adressing the handling of missing
values ? Sylvain has done some work on it for xtensor, you might be interested
in [https://github.com/QuantStack/xtensor/pull/196].
More generally, what would be the best process for you? I can open a dedicated
issue for this topic, so that we can identify all the possible problems and
start trying to solve them. Or I can start a draft and we can iterate (or maybe
you already started something I can contribute to). I guess this document could
go into arrow/cpp/doc, so I may open a PR with the initial draft.
> 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.
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