vvysotskyi opened a new pull request, #2733:
URL: https://github.com/apache/drill/pull/2733

   # [DRILL-8380](https://issues.apache.org/jira/browse/DRILL-8380): Remove 
customised SqlValidatorImpl.deriveAlias
   
   ## Description
   As pointed out in CALCITE-5463, `SqlValidatorImpl.deriveAlias` isn't 
intended to be customized, and it is not used in the latest version. It causes 
issues with table and storage aliases and temporary tables functionality.
   
   Unfortunately, there is no way to preserve existing temporary table 
behavior. After these changes, the temporary table will be accessible only 
within its workspace, as regular tables. 
   
   ## Documentation
   Yes.
   
   ## Testing
   All UT pass.
   


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