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[Doc][Minor][SparkR] Update SparkR doc for names, columns and colnames #17115

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[Doc][Minor][SparkR] Update SparkR doc for names, columns and colnames #17115

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8082c82
update R doc
actuaryzhang Mar 1, 2017
921c437
add tests
actuaryzhang Mar 1, 2017
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4 changes: 2 additions & 2 deletions R/pkg/R/DataFrame.R
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Original file line number Diff line number Diff line change
Expand Up @@ -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.
#'
Expand Down Expand Up @@ -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<-
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6 changes: 6 additions & 0 deletions R/pkg/inst/tests/testthat/test_sparkSQL.R
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Expand Up @@ -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", {
Expand Down