milanisvet commented on code in PR #49571:
URL: https://github.com/apache/spark/pull/49571#discussion_r1932461286
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala:
##########
@@ -714,6 +717,133 @@ case class UnionExec(children: Seq[SparkPlan]) extends
SparkPlan {
copy(children = newChildren)
}
+/**
+ * The physical node for recursion. Currently only UNION ALL case is supported.
+ * In the first iteration, anchor term is executed.
+ * Then, in each following iteration, the UnionLoopRef node is substituted
with the plan from the
+ * previous iteration, and such plan is executed.
+ * After every iteration, the dataframe is repartitioned.
+ * The recursion stops when the generated dataframe is empty, or either the
limit or
+ * the specified maximum depth from the config is reached.
+ *
+ * @param loopId The id of the loop.
+ * @param anchor The logical plan of the initial element of the loop.
+ * @param recursion The logical plan that describes the recursion with an
[[UnionLoopRef]] node.
+ * @param output The output attributes of this loop.
+ * @param limit In case we have a plan with the limit node, it is pushed down
to UnionLoop and then
Review Comment:
Done
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
