maryannxue commented on a change in pull request #23531:
URL: https://github.com/apache/spark/pull/23531#discussion_r416872953
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala
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@@ -253,6 +257,143 @@ case class FilterExec(condition: Expression, child:
SparkPlan)
}
}
+/**
+ * Physical plan node for a recursive relation that encapsulates the physical
plan of the anchor
+ * term and the logical plan of the recursive term.
+ *
+ * Anchor is used to initialize the query in the first run.
+ * Recursive term is used to extend the result with new rows, They are logical
plans and contain
+ * references to the result of the previous iteration or to the so far
accumulated result. These
+ * references are updated with new statistics and data and then compiled to
physical plan before
+ * execution.
+ *
+ * The execution terminates once the anchor term or an iteration of the
recursive term return no
+ * rows.
+ *
+ * @param cteName the name of the recursive relation
+ * @param anchorTerm this child is used for initializing the query
+ * @param output the attributes of the recursive relation
+ */
+case class RecursiveRelationExec(
+ cteName: String,
+ anchorTerm: SparkPlan,
+ output: Seq[Attribute]) extends SparkPlan {
+ @transient
+ lazy val logicalRecursiveTerm =
logicalLink.get.asInstanceOf[RecursiveRelation].recursiveTerm
Review comment:
I think a `transient` member would do
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