grouped_ffdf: A grouped ffdf.

Description

The easiest way to create a grouped ffdf is to call the group_by method on a ffdf or data source: this will take care of capturing the unevalated expressions for you.

Usage

grouped_ffdf(data, vars, is_sorted = FALSE)
is.grouped_ffdf(x)

Arguments

data

a data source or data frame.

vars

a list of quoted variables.

is_sorted

if data is sorted on vars is_sorted should be set to TRUE to avoid unnecesary sorting

an object to check