chunk_summarize {disk.frame} | R Documentation |
#' @export #' @importFrom dplyr add_count #' @rdname dplyr_verbs add_count.disk.frame <- create_chunk_mapper(dplyr::add_count) #' @export #' @importFrom dplyr add_tally #' @rdname dplyr_verbs add_tally.disk.frame <- create_chunk_mapper(dplyr::add_tally)
Description
The disk.frame group by operation perform group WITHIN each chunk. This is often used for performance reasons. If the user wishes to perform group-by, they may choose to use the 'hard_group_by' function which is expensive as it reorganizes the chunks by the shard key.
Usage
chunk_summarize(.data, ...)
chunk_summarise(.data, ...)
chunk_group_by(.data, ...)
chunk_ungroup(.data, ...)
Arguments
.data |
a disk.frame |
... |
passed to dplyr::group_by |
See Also
hard_group_by group_by
[Package disk.frame version 0.8.3 Index]