BryanCutler commented on issue #23760: [SPARK-26762][SQL][R] Arrow optimization for conversion from Spark DataFrame to R DataFrame URL: https://github.com/apache/spark/pull/23760#issuecomment-463012213 It might be a good idea to add a test that forces a delay on a partition execution so that you can verify that the R side receives them in the correct order. This was discussed [here](https://github.com/apache/spark/pull/22275#discussion_r232420076) and added in https://github.com/apache/spark/pull/22275/commits/bf2feec2ef023177d72ac1137dbd1b3a02eb9a89
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