mgaido91 commented on a change in pull request #23531: [SPARK-24497][SQL]
Support recursive SQL query
URL: https://github.com/apache/spark/pull/23531#discussion_r247537386
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/basicPhysicalOperators.scala
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@@ -225,6 +226,57 @@ case class FilterExec(condition: Expression, child:
SparkPlan)
override def outputPartitioning: Partitioning = child.outputPartitioning
}
+/** Physical plan for RecursiveTable. */
+case class RecursiveTableExec(
+ name: String,
+ anchorTerm: SparkPlan,
+ recursiveTerm: SparkPlan) extends SparkPlan {
+ override def children: Seq[SparkPlan] = Seq(anchorTerm, recursiveTerm)
+
+ override def output: Seq[Attribute] = anchorTerm.output
+
+ override val doNotPrepareInAdvance: Seq[SparkPlan] = Seq(recursiveTerm)
+
+ override protected def doExecute(): RDD[InternalRow] = {
+ var temp = anchorTerm.execute().map(_.copy()).cache()
+ var tempCount = temp.count()
+ var result = temp
+ var level = 0
+ do {
+ if (level > conf.getConf(SQLConf.RECURSION_LEVEL_LIMIT)) {
+ throw new SparkException(s"Recursion level limit reached but query
hasn't exhausted, try " +
Review comment:
nit: no `s`
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