Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/16954#discussion_r103411993
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala
---
@@ -40,19 +42,179 @@ abstract class PlanExpression[T <: QueryPlan[_]]
extends Expression {
/**
* A base interface for expressions that contain a [[LogicalPlan]].
*/
-abstract class SubqueryExpression extends PlanExpression[LogicalPlan] {
+abstract class SubqueryExpression(
+ plan: LogicalPlan,
+ children: Seq[Expression],
+ exprId: ExprId) extends PlanExpression[LogicalPlan] {
+
+ override lazy val resolved: Boolean = childrenResolved && plan.resolved
+ override lazy val references: AttributeSet =
+ if (plan.resolved) super.references -- plan.outputSet else
super.references
override def withNewPlan(plan: LogicalPlan): SubqueryExpression
+ override def semanticEquals(o: Expression): Boolean = o match {
+ case p: SubqueryExpression =>
+ this.getClass.getName.equals(p.getClass.getName) &&
plan.sameResult(p.plan) &&
+ children.length == p.children.length &&
+ children.zip(p.children).forall(p => p._1.semanticEquals(p._2))
+ case _ => false
+ }
}
object SubqueryExpression {
+ /**
+ * Returns true when an expression contains an IN or EXISTS subquery and
false otherwise.
+ */
+ def hasInOrExistsSubquery(e: Expression): Boolean = {
+ e.find {
+ case _: ListQuery | _: Exists => true
+ case _ => false
+ }.isDefined
+ }
+
+ /**
+ * Returns true when an expression contains a subquery that has outer
reference(s). The outer
+ * reference attributes are kept as children of subquery expression by
+ * [[org.apache.spark.sql.catalyst.analysis.Analyzer.ResolveSubquery]]
+ */
def hasCorrelatedSubquery(e: Expression): Boolean = {
e.find {
- case e: SubqueryExpression if e.children.nonEmpty => true
+ case s: SubqueryExpression if s.children.nonEmpty => true
case _ => false
}.isDefined
}
}
+object SubExprUtils extends PredicateHelper {
+ /**
+ * Returns true when an expression contains correlated predicates i.e
outer references and
+ * returns false otherwise.
+ */
+ def containsOuter(e: Expression): Boolean = {
+ e.find(_.isInstanceOf[OuterReference]).isDefined
+ }
+
+ /**
+ * Returns whether there are any null-aware predicate subqueries inside
Not. If not, we could
+ * turn the null-aware predicate into not-null-aware predicate.
+ */
+ def hasNullAwarePredicateWithinNot(e: Expression): Boolean = {
+ e.find{ x =>
+ x.isInstanceOf[Not] && e.find {
--- End diff --
@hvanhovell I actually had debugged this before and had completely
forgotten about it. The case you mention actually works ok because of the way
we invoke this functions. Please see the caller at -
[code](https://github.com/dilipbiswal/spark/blob/33844bb8c6e72c35e12a7ea9f124ad3c6b8bd43c/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala#L197-L204)
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