| selectExpr {SparkR} | R Documentation |
Select from a SparkDataFrame using a set of SQL expressions.
selectExpr(x, expr, ...) ## S4 method for signature 'SparkDataFrame,character' selectExpr(x, expr, ...)
x |
A SparkDataFrame to be selected from. |
expr |
A string containing a SQL expression |
... |
Additional expressions |
A SparkDataFrame
selectExpr since 1.4.0
Other SparkDataFrame functions: SparkDataFrame-class,
agg, arrange,
as.data.frame,
attach,SparkDataFrame-method,
cache, checkpoint,
coalesce, collect,
colnames, coltypes,
createOrReplaceTempView,
crossJoin, dapplyCollect,
dapply, describe,
dim, distinct,
dropDuplicates, dropna,
drop, dtypes,
except, explain,
filter, first,
gapplyCollect, gapply,
getNumPartitions, group_by,
head, hint,
histogram, insertInto,
intersect, isLocal,
isStreaming, join,
limit, merge,
mutate, ncol,
nrow, persist,
printSchema, randomSplit,
rbind, registerTempTable,
rename, repartition,
sample, saveAsTable,
schema, select,
showDF, show,
storageLevel, str,
subset, take,
toJSON, union,
unpersist, withColumn,
with, write.df,
write.jdbc, write.json,
write.orc, write.parquet,
write.stream, write.text
## Not run:
##D sparkR.session()
##D path <- "path/to/file.json"
##D df <- read.json(path)
##D selectExpr(df, "col1", "(col2 * 5) as newCol")
## End(Not run)