Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/10762#discussion_r51182725
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1159,6 +1161,41 @@ class Analyzer(
}
}
}
+
+ /**
+ * Removes natural joins by calculating output columns based on output
from two sides,
+ * Then apply a Project on a normal Join to eliminate natural join.
+ */
+ object ResolveNaturalJoin extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan = plan
resolveOperators {
+ // Should not skip unresolved nodes because natural join is always
unresolved.
+ case j @ Join(left, right, NaturalJoin(joinType), condition) if
j.partlyResolved =>
+ val joinNames =
left.output.map(_.name).intersect(right.output.map(_.name))
--- End diff --
you need to add more inline comment for this function to explain what's
going on
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