ex_data_table_step.relop_table_source: Build a data source description.

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

Build a data source description.

Description

data.table based implementation. Looks for tables first in tables and then in env. Will accept any data.frame that can be converted to data.table.

Usage

## S3 method for class 'relop_table_source'
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 <- build_frame(
    "x", "y" |
    2L , "b" |
    1L , "a" |
    3L , "c" )
rquery_pipeline <- local_td(dL)
dL %.>% rquery_pipeline

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