ex_data_table_step.relop_select_columns: Implement drop columns.

In WinVector/rqdatatable: 'rquery' for 'data.table'

Implement drop columns.

Description

data.table based implementation.

Usage

## S3 method for class 'relop_select_columns'
ex_data_table_step(
  optree,
  ...,
  tables = list(),
  source_usage = NULL,
  source_limit = NULL,
  env = parent.frame()
)

Arguments

optree	relop operations tree.
...	not used, force later arguments to bind by name.
tables	named list map from table names used in nodes to data.tables and data.frames.
source_usage	list mapping source table names to vectors of columns used.
source_limit	if not null limit all table sources to no more than this many rows (used for debugging).
env	environment to work in.

Examples

dL <- data.frame(x = 1, y = 2, z = 3)
rquery_pipeline <- local_td(dL) %.>%
  select_columns(., "y")
dL %.>% rquery_pipeline

WinVector/rqdatatable documentation built on Aug. 22, 2023, 3:25 p.m.