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[SPARK-18335][SPARKR] createDataFrame to support numPartitions parameter
## What changes were proposed in this pull request? To allow specifying number of partitions when the DataFrame is created ## How was this patch tested? manual, unit tests Author: Felix Cheung <felixcheung_m@hotmail.com> Closes #16512 from felixcheung/rnumpart.
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- R/pkg/R/SQLContext.R 14 additions, 6 deletionsR/pkg/R/SQLContext.R
- R/pkg/R/context.R 34 additions, 5 deletionsR/pkg/R/context.R
- R/pkg/inst/tests/testthat/test_rdd.R 2 additions, 2 deletionsR/pkg/inst/tests/testthat/test_rdd.R
- R/pkg/inst/tests/testthat/test_sparkSQL.R 22 additions, 1 deletionR/pkg/inst/tests/testthat/test_sparkSQL.R
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