[GitHub] [arrow] eitsupi commented on a diff in pull request #14387: ARROW-17665: [R] Document dplyr and compute functionality

[GitBox <gi...@apache.org>]

eitsupi commented on code in PR #14387:
URL: https://github.com/apache/arrow/pull/14387#discussion_r994613502


##########
r/R/arrow-package.R:
##########
@@ -38,21 +38,24 @@ supported_dplyr_methods <- list(
   select = NULL,
   filter = NULL,
   collect = NULL,
-  summarise = NULL,
+  summarise = c(
+    "window functions not currently supported;",
+    'arguments `.drop = FALSE` and `.groups = "rowwise" not supported'
+  ),
   group_by = NULL,
   groups = NULL,
   group_vars = NULL,
   group_by_drop_default = NULL,
   ungroup = NULL,
-  mutate = NULL,
+  mutate = "window functions not currently supported",

Review Comment:
   For users, it may be easier to explain that "mutate cannot be used after being grouped".



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