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[SPARK-19399][SPARKR] Add R coalesce API for DataFrame and Column
## What changes were proposed in this pull request? Add coalesce on DataFrame for down partitioning without shuffle and coalesce on Column ## How was this patch tested? manual, unit tests Author: Felix Cheung <felixcheung_m@hotmail.com> Closes #16739 from felixcheung/rcoalesce.
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- R/pkg/NAMESPACE 1 addition, 0 deletionsR/pkg/NAMESPACE
- R/pkg/R/DataFrame.R 43 additions, 3 deletionsR/pkg/R/DataFrame.R
- R/pkg/R/RDD.R 2 additions, 2 deletionsR/pkg/R/RDD.R
- R/pkg/R/functions.R 24 additions, 2 deletionsR/pkg/R/functions.R
- R/pkg/R/generics.R 8 additions, 1 deletionR/pkg/R/generics.R
- R/pkg/inst/tests/testthat/test_rdd.R 1 addition, 1 deletionR/pkg/inst/tests/testthat/test_rdd.R
- R/pkg/inst/tests/testthat/test_sparkSQL.R 27 additions, 5 deletionsR/pkg/inst/tests/testthat/test_sparkSQL.R
- core/src/main/scala/org/apache/spark/rdd/RDD.scala 2 additions, 1 deletioncore/src/main/scala/org/apache/spark/rdd/RDD.scala
- python/pyspark/sql/dataframe.py 9 additions, 1 deletionpython/pyspark/sql/dataframe.py
- sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala 9 additions, 1 deletionsql/core/src/main/scala/org/apache/spark/sql/Dataset.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala 9 additions, 1 deletion...g/apache/spark/sql/execution/basicPhysicalOperators.scala
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