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https://issues.apache.org/jira/browse/ARROW-725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15945774#comment-15945774
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Wes McKinney commented on ARROW-725:
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We talked about this at some point last year IIRC; since we just added
FixedWidthBinary, I think a FixedSizeList or some equivalent would be useful
and not too difficult to implement.
Like FW Binary, it drops the offsets vector, but otherwise the memory layout is
the same.
> [Format] Constant length list type
> ----------------------------------
>
> Key: ARROW-725
> URL: https://issues.apache.org/jira/browse/ARROW-725
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Brian Hulette
> Priority: Trivial
>
> It makes sense to store some data in a row-based format. For example, a
> position might be stored as two or three coordinates per row, and all of them
> will almost always be accessed simultaneously. Currently, arrow must store
> these as two or three separate vectors, but cache performance could
> potentially be improved if every coordinate for a given row were in the same
> location in memory.
> The List type could satisfy this requirement, but it requires an additional
> offset vector which isn't necessary when every element is the same size. I
> think it would be helpful to define a new type that is essentially a List
> with every element having the same length. I think "Tuple" would be a natural
> fit for this type but I'm open to other suggestions.
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