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## What changes were proposed in this pull request? Refactor RRDD by separating the common logic interacting with the R worker to a new class RRunner, which can be used to evaluate R UDFs. Now RRDD relies on RRuner for RDD computation and RRDD could be reomved if we want to remove RDD API in SparkR later. ## How was this patch tested? dev/lint-r SparkR unit tests Author: Sun Rui <rui.sun@intel.com> Closes #12024 from sun-rui/SPARK-12792_new. |
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