selectExpr: SelectExpr

In SparkR: R Front End for 'Apache Spark'

Description

Select from a SparkDataFrame using a set of SQL expressions.

Usage

selectExpr(x, expr, ...)

## S4 method for signature 'SparkDataFrame,character'
selectExpr(x, expr, ...)

Arguments

x	A SparkDataFrame to be selected from.
expr	A string containing a SQL expression
...	Additional expressions

Value

A SparkDataFrame

Note

selectExpr since 1.4.0

See Also

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(), select(), 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()

Examples

## Not run: 
sparkR.session()
path <- "path/to/file.json"
df <- read.json(path)
selectExpr(df, "col1", "(col2 * 5) as newCol")

## End(Not run)

SparkR documentation built on June 3, 2021, 5:05 p.m.