HyukjinKwon edited a comment 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-463892305 I hope we can go ahead as is if there are not notable comments to avoid conflict hell .. Currently I intentionally didn't start to work some items at https://github.com/apache/spark/pull/23787#issuecomment-463562490 to avoid conflicts but I am trying to complete all as soon as possible. FWIW, sparklyr already added Arrow optimization, [sparklyr#1611](https://github.com/rstudio/sparklyr/pull/1611) and https://arrow.apache.org/blog/2019/01/25/r-spark-improvements/
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