peter-toth commented on a change in pull request #23531: [SPARK-24497][SQL]
Support recursive SQL query
URL: https://github.com/apache/spark/pull/23531#discussion_r248284241
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
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@@ -205,30 +206,145 @@ class Analyzer(
CleanupAliases)
)
+ object ResolveRecursiveReferneces extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = {
+ val recursiveTables = plan.collect {
+ case rt @ RecursiveTable(name, _, _) if rt.anchorResolved => name -> rt
+ }.toMap
+
+ plan.resolveOperatorsUp {
+ case UnresolvedRecursiveReference(name) if
recursiveTables.contains(name) =>
+ RecursiveReference(name,
recursiveTables(name).output.map(_.newInstance()))
Review comment:
I added `_.newInstance()` because it simplifies `FoldablePropagation`. This
way we don't need to mess with attributes in it. Please see initial commit for
details.
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