HeartSaVioR commented on code in PR #39931:
URL: https://github.com/apache/spark/pull/39931#discussion_r1119402665
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sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala:
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@@ -324,6 +349,41 @@ object WatermarkSupport {
}
Some(evictionExpression)
}
+
+ /**
+ * Find the column which is marked as "event time" column.
+ *
+ * If there are multiple event time columns in given column list, the
behavior depends on the
+ * parameter `useFirstOccurrence`. If it's set to true, the first occurred
column will be
+ * returned. If not, this method will throw an AnalysisException as it is
not allowed to have
+ * multiple event time columns.
+ */
+ def findEventTimeColumn(
+ attrs: Seq[Attribute],
+ useFirstOccurrence: Boolean): Option[Attribute] = {
Review Comment:
Good suggestion.
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