nealrichardson commented on a change in pull request #10888:
URL: https://github.com/apache/arrow/pull/10888#discussion_r683681911
##########
File path: r/R/dataset-scan.R
##########
@@ -85,10 +85,22 @@ Scanner$create <- function(dataset,
# To handle mutate() on Table/RecordBatch, we need to
collect(as_data_frame=FALSE) now
dataset <- dplyr::collect(dataset, as_data_frame = FALSE)
}
+
+ proj<- c(dataset$selected_columns, dataset$temp_columns)
+ if (!is.null(projection)) {
+ # TODO: should we check names and make sure we only project once per?
+ proj <- c(proj, projection)
+ }
+
+ filt <- dataset$filtered_rows
+ if (!isTRUE(filter)) {
+ filt <- build_expr("&", filt, filter)
+ }
+
Review comment:
Use this helper to handle a few other edge cases (then restore
`dataset$filtered_rows` in the call to Scanner$create below)
```suggestion
if (!isTRUE(filter)) {
dataset <- set_filter(dataset, filter)
}
```
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