danny0405 commented on a change in pull request #13577:
URL: https://github.com/apache/flink/pull/13577#discussion_r505135294
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File path:
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/functions/utils/UserDefinedFunctionUtils.scala
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@@ -372,6 +373,9 @@ object UserDefinedFunctionUtils {
override def getConsistency: Consistency = Consistency.NONE
+ override def paramTypes(typeFactory: RelDataTypeFactory):
util.List[RelDataType] = null
Review comment:
It is never used, if there is NPE, it should be a bug.
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