Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/11204#discussion_r52968331
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/SparkSqlParser.g
---
@@ -2320,6 +2320,19 @@ regularBody[boolean topLevel]
)
|
selectStatement[topLevel]
+ |
+ (LPAREN selectStatement[true]) => nestedSetOpSelectStatement[topLevel]
+ ;
+
+nestedSetOpSelectStatement[boolean topLevel]
+ :
+ (
+ LPAREN s=selectStatement[topLevel] RPAREN -> {$s.tree}
+ )
+ (set=setOpSelectStatement[$nestedSetOpSelectStatement.tree, topLevel])
--- End diff --
I made a little to support recursively nested UNION. I also updated the
test. But it is basically the same approach.
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