Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21045#discussion_r188189939
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameFunctionsSuite.scala ---
@@ -372,6 +372,24 @@ class DataFrameFunctionsSuite extends QueryTest with
SharedSQLContext {
)
}
+ test("dataframe zip function") {
--- End diff --
Add some test cases with `nulls`.
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