abhishek-das-gupta opened a new pull request #2757:
URL: https://github.com/apache/calcite/pull/2757


   Add a "SELECT *" wrap over SqlJoin in SqlJoin#toSqlString
   
   Resolves the RuntimeException seen in SqlJoin#toString
   
   Override SqlNode#toSqlString in SqlJoin
   
   Reason: SqlJoin#unparse method calls SqlPrettyWriter#sep with frame being 
NULL
   
   This change is less fragile than to mutate internal frame state


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