Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/10762#discussion_r49813672 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala --- @@ -179,10 +180,15 @@ object SqlParser extends AbstractSparkSQLParser with DataTypeParser { ) protected lazy val joinedRelation: Parser[LogicalPlan] = - relationFactor ~ rep1(joinType.? ~ (JOIN ~> relationFactor) ~ joinConditions.?) ^^ { + relationFactor ~ + rep1(NATURAL.? ~ joinType.? ~ (JOIN ~> relationFactor) ~ joinConditions.?) ^^ { case r1 ~ joins => - joins.foldLeft(r1) { case (lhs, jt ~ rhs ~ cond) => - Join(lhs, rhs, joinType = jt.getOrElse(Inner), cond) + joins.foldLeft(r1) { case (lhs, n ~ jt ~ rhs ~ cond) => + if (n.isDefined) { + NaturalJoin(lhs, rhs, joinType = jt.getOrElse(Inner), cond) --- End diff -- can't we just create a new join type rather than creating a whole new logical operator?
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