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Posted to issues@arrow.apache.org by "Anthony Abate (Jira)" <ji...@apache.org> on 2019/09/25 03:33:00 UTC

[jira] [Created] (ARROW-6681) [C# -> R] - Record Batches in reverse order?

Anthony Abate created ARROW-6681:
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             Summary: [C# -> R] - Record Batches in reverse order?
                 Key: ARROW-6681
                 URL: https://issues.apache.org/jira/browse/ARROW-6681
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C#
    Affects Versions: 0.14.1
            Reporter: Anthony Abate


Are 'RecordBatches' being in C# being written in reverse order?

I made a simple test which creates a single row per record batch of 0 to 99 and attempted to read this in R. To my surprise batch(0) in R had the value 99 not 0

This may not seem like a big deal, however when dealing with 'huge' files, its more efficient to use Record Batches / index lookup than attempting to load the entire file into memory.

Having the order consistent within the different language / API seems only to make sense - for now I can work around this by reversing the order before writing.

 

https://github.com/apache/arrow/issues/5475

 



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