Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/17568#discussion_r110510575 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -2230,6 +2230,8 @@ class Analyzer( val result = resolved transformDown { case UnresolvedMapObjects(func, inputData, cls) if inputData.resolved => inputData.dataType match { + case ArrayType(et, false) if cls.isEmpty => --- End diff -- To be safe, we should check: 1. no custom collection class specified 2. the `function` will convert an expression `e` to `AssertNotNull(e)`(this guarantees we are expecting a primitive array) 3. the `inputData` is of type array and its element is not nullable.
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