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## What changes were proposed in this pull request? Add storageLevel to DataFrame for SparkR. This is similar to this RP: https://github.com/apache/spark/pull/13780 but in R I do not make a class for `StorageLevel` but add a method `storageToString` ## How was this patch tested? test added. Author: WeichenXu <WeichenXu123@outlook.com> Closes #15516 from WeichenXu123/storageLevel_df_r. |
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