Github user icexelloss commented on a diff in the pull request:
https://github.com/apache/spark/pull/21082#discussion_r190060086
--- 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 --
This is used for grouping window functions into sql window functions and
pandas UDFs and create different logical node for them. The value is used here
https://github.com/apache/spark/pull/21082/files#diff-57b3d87be744b7d79a9beacf8e5e5eb2R1886
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