cloud-fan commented on a change in pull request #25215:
[SPARK-28445][SQL][Python] Fix error when PythonUDF is used in both group by
and aggregate expression
URL: https://github.com/apache/spark/pull/25215#discussion_r308065888
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/python/ExtractPythonUDFs.scala
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@@ -81,6 +81,64 @@ object ExtractPythonUDFFromAggregate extends
Rule[LogicalPlan] {
}
}
+/**
+ * Extracts PythonUDFs in logical aggregate, which are used in grouping keys,
evaluate them
+ * before aggregate.
+ * This must be executed after `ExtractPythonUDFFromAggregate` rule and before
`ExtractPythonUDFs`.
+ */
+object ExtractGroupingPythonUDFFromAggregate extends Rule[LogicalPlan] {
Review comment:
what's the difference between this rule and ExtractPythonUDFFromAggregate?
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