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[SPARK-18788][SPARKR] Add API for getNumPartitions
## What changes were proposed in this pull request? With doc to say this would convert DF into RDD ## How was this patch tested? unit tests, manual tests Author: Felix Cheung <felixcheung_m@hotmail.com> Closes #16668 from felixcheung/rgetnumpartitions. (cherry picked from commit 90817a6c) Signed-off-by:Felix Cheung <felixcheung@apache.org>
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- R/pkg/NAMESPACE 1 addition, 0 deletionsR/pkg/NAMESPACE
- R/pkg/R/DataFrame.R 23 additions, 0 deletionsR/pkg/R/DataFrame.R
- R/pkg/R/RDD.R 15 additions, 15 deletionsR/pkg/R/RDD.R
- R/pkg/R/generics.R 6 additions, 2 deletionsR/pkg/R/generics.R
- R/pkg/R/pairRDD.R 2 additions, 2 deletionsR/pkg/R/pairRDD.R
- R/pkg/inst/tests/testthat/test_rdd.R 5 additions, 5 deletionsR/pkg/inst/tests/testthat/test_rdd.R
- R/pkg/inst/tests/testthat/test_sparkSQL.R 7 additions, 7 deletionsR/pkg/inst/tests/testthat/test_sparkSQL.R
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