viirya commented on a change in pull request #32303:
URL: https://github.com/apache/spark/pull/32303#discussion_r619571252
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
##########
@@ -2234,6 +2270,74 @@ class Analyzer(override val catalogManager:
CatalogManager)
}
}
+ /**
+ * This rule resolves lateral joins.
+ */
+ object ResolveLateralJoin extends Rule[LogicalPlan] {
+ import ResolveReferences._
+
+ /**
+ * Build a project list for Project/Aggregate and expand the star if
possible by first using
+ * the inner query plan. If failed, use the outer query plan to expand the
star and wrap all
+ * expanded attributes in [[OuterReference]]s.
+ */
+ private def expandOuterReference(
+ expressions: Seq[NamedExpression],
+ inner: LogicalPlan,
+ outer: LogicalPlan): Seq[NamedExpression] = {
+
+ def expandInner(star: Star): Seq[NamedExpression] =
+ star.expand(inner, resolver)
+
+ // Leave the star unchanged if the outer plan is unable to resolve the
star.
+ // Otherwise wrap the resolved attributes in outer references.
+ def expandOuter(star: Star): Seq[NamedExpression] = {
+ star.expand(outer, resolver).map {
+ case s: Star => s
+ case other => other
+ .transform { case a: Attribute => OuterReference(a) }
+ .asInstanceOf[NamedExpression]
+ }
+ }
+
+ buildExpandedProjectList(
+ buildExpandedProjectList(expressions, inner, expandInner),
Review comment:
If inner `buildExpandedProjectList` was fully resolved, do we still need
run outer `buildExpandedProjectList`?
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