Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/14867#discussion_r77439638
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -374,15 +374,17 @@ setQuantifier
;
relation
- : left=relation
- ((CROSS | joinType) JOIN right=relation joinCriteria?
- | NATURAL joinType JOIN right=relation
- ) #joinRelation
- | relationPrimary #relationDefault
+ : relationPrimary joinRelation*
+ ;
+
+joinRelation
+ : joinType JOIN right=relationPrimary joinCriteria?
+ | NATURAL joinType JOIN right=relationPrimary
;
--- End diff --
I had to move the code around. I have added a check in the AstBuilder
(spark side of the parser) to catch this.
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