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Commit 40984f67 authored by Sun Rui's avatar Sun Rui Committed by Davies Liu
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[SPARK-12792] [SPARKR] Refactor RRDD to support R UDF. 

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.

Author: Sun Rui <rui.sun@intel.com>

Closes #10947 from sun-rui/SPARK-12792.
parent 68c0c460
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