Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21082#discussion_r184875000
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -112,12 +113,19 @@ trait CheckAnalysis extends PredicateHelper {
failAnalysis("An offset window function can only be evaluated
in an ordered " +
s"row-based window frame with a single offset: $w")
+ case w @ WindowExpression(_: PythonUDF,
+ WindowSpecDefinition(_, _, frame: SpecifiedWindowFrame))
--- End diff --
indentation :-)
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