jingshanglu commented on a change in pull request #7778:
URL: https://github.com/apache/shardingsphere/pull/7778#discussion_r504357612
##########
File path:
shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-sqlserver/src/main/antlr4/imports/sqlserver/DMLStatement.g4
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@@ -73,11 +73,15 @@ multipleTableNames
;
select
- : unionClause
+ : aggregationClause
+ ;
+
+aggregationClause
+ : selectClause ((UNION (ALL)? | EXCEPT | INTERSECT) selectClause)*
;
unionClause
- : selectClause (UNION (ALL | DISTINCT)? selectClause)*
+ : selectClause (UNION (ALL)? selectClause)*
;
Review comment:
Can these two rules be combined? Since the reference in the subquery is
unionClause. The subquery and SELECT should have the same semantics,right?
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