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[SPARK-12234] [SparkR] Fix subset function error when only set select argument #10217

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[SPARK-12234] [SparkR] Fix subset function error when only set select argument #10217

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5c71cd3
Fix subset error when only set select argument
yanboliang Dec 9, 2015
92b1bd7
add example code
yanboliang Dec 9, 2015
acc8457
mark optional for subset argument
yanboliang Dec 9, 2015
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7 changes: 6 additions & 1 deletion R/pkg/R/DataFrame.R
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Original file line number Diff line number Diff line change
Expand Up @@ -1206,10 +1206,15 @@ setMethod("[", signature(x = "DataFrame", i = "Column"),
#' df[df$age %in% c(19, 30), 1:2]
#' subset(df, df$age %in% c(19, 30), 1:2)
#' subset(df, df$age %in% c(19), select = c(1,2))
#' subset(df, select = c(1,2))
#' }
setMethod("subset", signature(x = "DataFrame"),
function(x, subset, select, ...) {
x[subset, select, ...]
if (missing(subset)) {
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@felixcheung felixcheung Dec 9, 2015

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best if we could add an example above

x[, select, ...]
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@sun-rui sun-rui Dec 9, 2015

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2-space ident

} else {
x[subset, select, ...]
}
})

#' Select
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4 changes: 4 additions & 0 deletions R/pkg/inst/tests/testthat/test_sparkSQL.R
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Expand Up @@ -799,6 +799,10 @@ test_that("subsetting", {
expect_equal(count(df6), 1)
expect_equal(columns(df6), c("name", "age"))

df7 <- subset(df, select = "name")
expect_equal(count(df7), 3)
expect_equal(columns(df7), c("name"))

# Test base::subset is working
expect_equal(nrow(subset(airquality, Temp > 80, select = c(Ozone, Temp))), 68)
})
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