Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/11190#discussion_r52847723
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/ExpressionParser.g
---
@@ -205,6 +205,8 @@ atomExpression
| whenExpression
| (functionName LPAREN) => function
| tableOrColumn
+ | (LPAREN KW_SELECT) => subQueryExpression
--- End diff --
Could you also add the subQueryExpression rule to this PR?
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