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Showing content from https://winvector.github.io/rquery/reference/columns_used.html below:

Return columns used — columns_used • rquery

Return columns used

columns_used(x, ..., using = NULL)

rquery operation tree.

generic additional arguments (not used)

character, if not NULL set of columns used from above.

vector of table qualified column names.

if (requireNamespace("DBI"
, quietly 
= TRUE) && requireNamespace("RSQLite"
, quietly 
= TRUE)) {
  my_db <- DBI::dbConnect(RSQLite::SQLite()
, 
":memory:")
  d1 <- rq_copy_to(my_db
, 
'd1'
, 
data.frame(
AUC 
= 0.6
, R2 
= 0.2))
  d2 <- rq_copy_to(my_db
, 
'd2'
, 
data.frame(
AUC 
= 0.6
, D 
= 0.3))
  optree <- natural_join(d1
, 
d2
, by 
= "AUC")
  cat(format(optree))
  print(columns_used(optree))
  DBI::dbDisconnect(my_db)
}
#> mk_td("d1", c(
#>   "AUC",
#>   "R2")) %.>%
#>  natural_join(.,
#>   mk_td("d2", c(
#>     "AUC",
#>     "D")),
#>   jointype = "INNER", by = c('AUC'))
#> $d1
#> [1] "AUC" "R2" 
#> 
#> $d2
#> [1] "AUC" "D"  
#> 

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