Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://spark.apache.org/docs/latest/api/R/reference/select.html below:

Select — select • SparkR

Selects a set of columns with names or Column expressions.

select(x, col, ...)

# S4 method for class 'SparkDataFrame'
x$name

# S4 method for class 'SparkDataFrame'
x$name <- value

# S4 method for class 'SparkDataFrame,character'
select(x, col, ...)

# S4 method for class 'SparkDataFrame,Column'
select(x, col, ...)

# S4 method for class '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 col. If more than one column is assigned in col, ... should be left empty.

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 NULL. If NULL, the specified Column is dropped.

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(), unpivot(), withColumn(), withWatermark(), with(), write.df(), write.jdbc(), write.json(), write.orc(), write.parquet(), write.stream(), write.text()

Other subsetting functions: filter(), subset()

if (FALSE) { # \dontrun{
  select(df, "*")
  select(df, "col1", "col2")
  select(df, df$name, df$age + 1)
  select(df, c("col1", "col2"))
  select(df, list(df$name, df$age + 1))
  # Similar to R data frames columns can also be selected using $
  df[,df$age]
} # }

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4