Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21228#discussion_r185784148
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -561,6 +571,7 @@ object functions {
* The function by default returns the last values it sees. It will
return the last non-null
* value it sees when ignoreNulls is set to true. If all values are
null, then null is returned.
*
+ * @note the function is non-deterministic
--- End diff --
dot at the end.
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