Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/11204#discussion_r52862728 --- 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] --- End diff -- Passing `true` or `false` here doesn't really matter. This `topLevel` argument works only in `setOpSelectStatement` rule. We will pass in the real `topLevel` argument into the rule later.
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