Brian Hulette created ARROW-725:
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Summary: [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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