viirya commented on a change in pull request #23531: [SPARK-24497][SQL] Support
recursive SQL query
URL: https://github.com/apache/spark/pull/23531#discussion_r248278763
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
##########
@@ -47,6 +48,40 @@ case class Subquery(child: LogicalPlan) extends
OrderPreservingUnaryNode {
override def output: Seq[Attribute] = child.output
}
+case class RecursiveTable(
+ name: String,
+ anchorTerm: LogicalPlan,
+ recursiveTerm: LogicalPlan) extends LogicalPlan {
+ override def children: Seq[LogicalPlan] = Seq(anchorTerm, recursiveTerm)
+
+ override def output: Seq[Attribute] =
anchorTerm.output.map(_.withNullability(true))
+
+ override lazy val resolved: Boolean = {
+ val numberOfOutputMatches =
+ childrenResolved &&
+ anchorTerm.output.length > 0 &&
+ anchorTerm.output.length == recursiveTerm.output.length
+ if (numberOfOutputMatches) {
+ val typeOfOutputMatches =
anchorTerm.output.zip(recursiveTerm.output).forall {
+ case (l, r) => l.dataType.sameType(r.dataType)
+ }
+ if (!typeOfOutputMatches) {
+ throw new AnalysisException(s"Anchor term types
${anchorTerm.output.map(_.dataType)} " +
+ s"and recursive term types ${recursiveTerm.output.map(_.dataType)}
doesn't match")
+ }
+ }
+ numberOfOutputMatches
+ }
+
+ lazy val anchorResolved = anchorTerm.resolved
+}
+
+case class RecursiveReference(name: String, output: Seq[Attribute]) extends
LeafNode {
Review comment:
Add doc for it?
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
With regards,
Apache Git Services
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
