unionall {rquery}

Make an unionall node (not a relational operation).

Description

Concatenate tables by rows.

Usage

unionall(sources, env = parent.frame())

Arguments

sources

list of relop trees or list of data.frames

env

environment to look to.

Value

order_by node or altered data.frame.

Examples

if (requireNamespace("DBI", quietly = TRUE) && requireNamespace("RSQLite", quietly = TRUE)) {
  my_db <- DBI::dbConnect(RSQLite::SQLite(), ":memory:")
  d <- rq_copy_to(my_db, 'd',
                   data.frame(AUC = 0.6, R2 = 0.2))
  optree <- unionall(list(d, d, d))
  cat(format(optree))
  sql <- to_sql(optree, my_db, limit = 2)
  cat(sql)
  print(DBI::dbGetQuery(my_db, sql))
  DBI::dbDisconnect(my_db)
}