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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