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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/05/18 17:41:03 UTC

[GitHub] [shardingsphere] ThanoshanMV edited a comment on pull request #10381: Proofread Oracle `SELECT` subquery clause

ThanoshanMV edited a comment 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 me an error `selectSubquery` is mutually left-recursive. So I changed it like `unionClause`. How shall we complete it?
   
   I removed `?` from the `rowLimitingClause` as it gave me a warning `selectSubquery contains an optional block with at least one alternative that can match an empty string`.
   


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