Github user ueshin commented on a diff in the pull request: https://github.com/apache/spark/pull/21082#discussion_r190340070 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -1869,6 +1870,8 @@ class Analyzer( case window: WindowExpression => window.windowSpec }.distinct + val windowFunctionType = WindowFunctionType.functionType(expr) --- End diff -- Oh, now I understand that the long block is for `groupBy`, so the tuple will be the group key, right? I misread the block was for `map` or something. Thanks!
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