Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/15567#discussion_r86018687
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -264,23 +264,43 @@ trait NonSQLExpression extends Expression {
}
}
+/**
+ * Trait for expressions that requires initialization based on the
partition index prior to task
+ * execution on a partition.
+ */
+trait PartitionDependent {
--- End diff --
as discussed offline this is StatefulExpression
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