SparkR (version 2.1.2)

head: Head

Description

Return the first num rows of a SparkDataFrame as a R data.frame. If num is not specified, then head() returns the first 6 rows as with R data.frame.

Usage

# S4 method for SparkDataFrame
head(x, num = 6L)

Arguments

x

a SparkDataFrame.

num

the number of rows to return. Default is 6.

Value

A data.frame.

See Also

Other SparkDataFrame functions: SparkDataFrame-class, agg, arrange, as.data.frame, attach, cache, coalesce, collect, colnames, coltypes, createOrReplaceTempView, crossJoin, dapplyCollect, dapply, describe, dim, distinct, dropDuplicates, dropna, drop, dtypes, except, explain, filter, first, gapplyCollect, gapply, getNumPartitions, group_by, histogram, insertInto, intersect, isLocal, join, limit, merge, mutate, ncol, nrow, persist, printSchema, randomSplit, rbind, registerTempTable, rename, repartition, sample, saveAsTable, schema, selectExpr, select, showDF, show, storageLevel, str, subset, take, union, unpersist, withColumn, with, write.df, write.jdbc, write.json, write.orc, write.parquet, write.text

Examples

# NOT RUN {
sparkR.session()
path <- "path/to/file.json"
df <- read.json(path)
head(df)
# }