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| author | actuaryzhang <actuaryzhang10@gmail.com> | 2017-03-01 12:35:56 -0800 |
|---|---|---|
| committer | Felix Cheung <felixcheung@apache.org> | 2017-03-01 12:35:56 -0800 |
| commit | 2ff1467d676c9671da231db86bdc8e09c7450f80 (patch) | |
| tree | 5841c3f7d8d37e0e17140468eb43568bcc54ea31 /R | |
| parent | 417140e441505f20eb5bd4943ce216c3ec6adc10 (diff) | |
| download | spark-2ff1467d676c9671da231db86bdc8e09c7450f80.tar.gz spark-2ff1467d676c9671da231db86bdc8e09c7450f80.tar.bz2 spark-2ff1467d676c9671da231db86bdc8e09c7450f80.zip | |
[DOC][MINOR][SPARKR] Update SparkR doc for names, columns and colnames
Update R doc:
1. columns, names and colnames returns a vector of strings, not **list** as in current doc.
2. `colnames<-` does allow the subset assignment, so the length of `value` can be less than the number of columns, e.g., `colnames(df)[1] <- "a"`.
felixcheung
Author: actuaryzhang <actuaryzhang10@gmail.com>
Closes #17115 from actuaryzhang/sparkRMinorDoc.
Diffstat (limited to 'R')
| -rw-r--r-- | R/pkg/R/DataFrame.R | 4 | ||||
| -rw-r--r-- | R/pkg/inst/tests/testthat/test_sparkSQL.R | 6 |
2 files changed, 8 insertions, 2 deletions
diff --git a/R/pkg/R/DataFrame.R b/R/pkg/R/DataFrame.R index cc4cfa3423..e33d0d8e29 100644 --- a/R/pkg/R/DataFrame.R +++ b/R/pkg/R/DataFrame.R @@ -280,7 +280,7 @@ setMethod("dtypes", #' Column Names of SparkDataFrame #' -#' Return all column names as a list. +#' Return a vector of column names. #' #' @param x a SparkDataFrame. #' @@ -338,7 +338,7 @@ setMethod("colnames", }) #' @param value a character vector. Must have the same length as the number -#' of columns in the SparkDataFrame. +#' of columns to be renamed. #' @rdname columns #' @aliases colnames<-,SparkDataFrame-method #' @name colnames<- diff --git a/R/pkg/inst/tests/testthat/test_sparkSQL.R b/R/pkg/inst/tests/testthat/test_sparkSQL.R index ce0f5a198a..1dd8c5ce6c 100644 --- a/R/pkg/inst/tests/testthat/test_sparkSQL.R +++ b/R/pkg/inst/tests/testthat/test_sparkSQL.R @@ -898,6 +898,12 @@ test_that("names() colnames() set the column names", { expect_equal(names(z)[3], "c") names(z)[3] <- "c2" expect_equal(names(z)[3], "c2") + + # Test subset assignment + colnames(df)[1] <- "col5" + expect_equal(colnames(df)[1], "col5") + names(df)[2] <- "col6" + expect_equal(names(df)[2], "col6") }) test_that("head() and first() return the correct data", { |