ThanoshanMV commented on a change in pull request #10381:
URL: https://github.com/apache/shardingsphere/pull/10381#discussion_r635386640
##########
File path:
shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-oracle/src/main/antlr4/imports/oracle/DMLStatement.g4
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@@ -101,15 +101,19 @@ multipleTableNames
;
select
- : unionClause
+ : selectSubquery forUpdateClause?
+ ;
+
+selectSubquery
+ : (selectClause | selectClause ((UNION ALL? | INTERSECT | MINUS)
selectSubquery)+ | LP_ selectSubquery RP_) orderByClause? rowLimitingClause
Review comment:
To resolve the mutually left-recursive error, I tried with this
definition:
```
select
: selectSubquery forUpdateClause?
;
selectSubquery
: (queryBlock | selectUnionClause | parenthesisSelectSubquery)
orderByClause? rowLimitingClause
;
selectUnionClause
: ((queryBlock | parenthesisSelectSubquery) orderByClause?
rowLimitingClause) ((UNION ALL? | INTERSECT | MINUS) selectSubquery)+
;
parenthesisSelectSubquery
: LP_ selectSubquery RP_
;
```
It worked without that error. Because of mutually left-recursive error, I
didn't add `selectUnionClause` in `selectUnionClause`'s definition and only
specified `(queryBlock | parenthesisSelectSubquery)`.
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