thisisnic commented on code in PR #12826:
URL: https://github.com/apache/arrow/pull/12826#discussion_r932678239
##########
r/R/dplyr-collect.R:
##########
@@ -107,6 +109,14 @@ implicit_schema <- function(.data) {
.data <- ensure_group_vars(.data)
old_schm <- .data$.data$schema
+ missing_fields <- .data$selected_columns[
+ setdiff(
+ names(.data$selected_columns),
+ names(old_schm)
+ )]
+
+ purrr::iwalk(missing_fields, ~if(.x$field_name == "__filename") old_schm <<-
old_schm$AddField(0, field(.y, string())))
Review Comment:
@nealrichardson Is there anything obvious I'm doing wrong here?
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