rename_columns {rquery} | R Documentation |
Make a rename columns node (copies columns not renamed).
Description
Make a rename columns node (copies columns not renamed).
Usage
rename_columns(source, cmap, env = parent.frame())
Arguments
source |
source to rename from. |
cmap |
map written as new column names as keys and old column names as values. |
env |
environment to look to. |
Value
rename columns node.
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, z = 3))
op_tree <- rename_columns(d, c('R2' %:=% 'AUC', 'AUC' %:=% 'R2'))
cat(format(op_tree))
sql <- to_sql(op_tree, my_db)
cat(sql)
print(DBI::dbGetQuery(my_db, sql))
DBI::dbDisconnect(my_db)
}
[Package rquery version 1.4.99 Index]