ThanoshanMV commented on pull request #10381:
URL: https://github.com/apache/shardingsphere/pull/10381#issuecomment-843385076
@wgy8283335 for the `selectSubquery`, I specified as:
```
selectSubquery
: (selectClause | selectSubquery ((UNION ALL? | INTERSECT | MINUS)
selectSubquery)+ | LP_ selectSubquery RP_) orderByClause? rowLimitingClause
;
```
But the ANTLR gave an error: `selectSubquery` is mutually left-recursive. So
I changed it like `unionClause`.
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