Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/10660#discussion_r49202296
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/SparkSqlParser.g
---
@@ -2216,6 +2216,8 @@ regularBody[boolean topLevel]
selectStatement[boolean topLevel]
:
(
+ (
+ LPAREN
--- End diff --
Because in the following we need to access some of the sub clauses such as
selectClause, clusterByClause, etc., with the syntax seems we can't simply
extract the common part as a single rule.
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