Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/10290#discussion_r47676515
--- Diff: docs/sparkr.md ---
@@ -387,3 +387,10 @@ The following functions are masked by the SparkR
package:
Since part of SparkR is modeled on the `dplyr` package, certain functions
in SparkR share the same names with those in `dplyr`. Depending on the load
order of the two packages, some functions from the package loaded first are
masked by those in the package loaded after. In such case, prefix such calls
with the package name, for instance, `SparkR::cume_dist(x)` or
`dplyr::cume_dist(x)`.
You can inspect the search path in R with
[`search()`](https://stat.ethz.ch/R-manual/R-devel/library/base/html/search.html)
+
+
+# Migration Guide
+
+## Upgrading From SparkR 1.6 to 1.7
+
+ - Before Spark 1.7, the default save mode is `append` in api
saveDF/write.df/saveAsTable, it is changed to `error` to be consistent with
scala api.
--- End diff --
Same as above
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