| select {SparkR} | R Documentation |
Selects a set of columns with names or Column expressions.
select(x, col, ...) ## S4 method for signature 'SparkDataFrame' x$name ## S4 replacement method for signature 'SparkDataFrame' x$name <- value ## S4 method for signature 'SparkDataFrame,character' select(x, col, ...) ## S4 method for signature 'SparkDataFrame,Column' select(x, col, ...) ## S4 method for signature 'SparkDataFrame,list' select(x, col)
x |
a SparkDataFrame. |
col |
a list of columns or single Column or name. |
... |
additional column(s) if only one column is specified in |
name |
name of a Column (without being wrapped by |
value |
a Column or an atomic vector in the length of 1 as literal value, or |
A new SparkDataFrame with selected columns.
$ since 1.4.0
$<- since 1.4.0
select(SparkDataFrame, character) since 1.4.0
select(SparkDataFrame, Column) since 1.4.0
select(SparkDataFrame, list) since 1.4.0
Other SparkDataFrame functions:
SparkDataFrame-class,
agg(),
alias(),
arrange(),
as.data.frame(),
attach,SparkDataFrame-method,
broadcast(),
cache(),
checkpoint(),
coalesce(),
collect(),
colnames(),
coltypes(),
createOrReplaceTempView(),
crossJoin(),
cube(),
dapplyCollect(),
dapply(),
describe(),
dim(),
distinct(),
dropDuplicates(),
dropna(),
drop(),
dtypes(),
exceptAll(),
except(),
explain(),
filter(),
first(),
gapplyCollect(),
gapply(),
getNumPartitions(),
group_by(),
head(),
hint(),
histogram(),
insertInto(),
intersectAll(),
intersect(),
isLocal(),
isStreaming(),
join(),
limit(),
localCheckpoint(),
merge(),
mutate(),
ncol(),
nrow(),
persist(),
printSchema(),
randomSplit(),
rbind(),
rename(),
repartitionByRange(),
repartition(),
rollup(),
sample(),
saveAsTable(),
schema(),
selectExpr(),
showDF(),
show(),
storageLevel(),
str(),
subset(),
summary(),
take(),
toJSON(),
unionAll(),
unionByName(),
union(),
unpersist(),
withColumn(),
withWatermark(),
with(),
write.df(),
write.jdbc(),
write.json(),
write.orc(),
write.parquet(),
write.stream(),
write.text()
Other subsetting functions:
filter(),
subset()
## Not run:
##D select(df, "*")
##D select(df, "col1", "col2")
##D select(df, df$name, df$age + 1)
##D select(df, c("col1", "col2"))
##D select(df, list(df$name, df$age + 1))
##D # Similar to R data frames columns can also be selected using $
##D df[,df$age]
## End(Not run)