SparkR (version 2.1.2)

count: Count

Description

Count the number of rows for each group when we have GroupedData input. The resulting SparkDataFrame will also contain the grouping columns.

This can be used as a column aggregate function with Column as input, and returns the number of items in a group.

Usage

count(x)
n(x)
# S4 method for GroupedData
count(x)
# S4 method for Column
count(x)
# S4 method for Column
n(x)

Arguments

x

a GroupedData or Column.

Value

A SparkDataFrame.

See Also

Other agg_funcs: agg, avg, countDistinct, first, kurtosis, last, max, mean, min, sd, skewness, stddev_pop, stddev_samp, sumDistinct, sum, var_pop, var_samp, var

Examples

# NOT RUN {
  count(groupBy(df, "name"))
# }
# NOT RUN {
count(df$c)
# }
# NOT RUN {
n(df$c)
# }