Github user NarineK commented on a diff in the pull request:
https://github.com/apache/spark/pull/14431#discussion_r124327866
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1465,10 +1464,10 @@ setMethod("dapplyCollect",
#'
#' Result
#' ---------
-#' Model (Intercept) Sepal_Width Petal_Length Petal_Width
-#' 1 0.699883 0.3303370 0.9455356 -0.1697527
-#' 2 1.895540 0.3868576 0.9083370 -0.6792238
-#' 3 2.351890 0.6548350 0.2375602 0.2521257
+#' Model Species (Intercept) Sepal_Width Petal_Length Petal_Width
--- End diff --
In the past we had a discussion about backward compatibility with shivaram.
https://github.com/apache/spark/pull/14431#issuecomment-236643502
I think I didn't push R changes, because I wanted to be able to access the
grouping columns on sql side first. Without being able to access the grouping
columns I couldn't find a way to keep backward compatibility without breaking
anything.
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