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From "Jinfeng Ni (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5378) Put more information into SchemaChangeException when HashJoin hit SchemaChangeException
Date Fri, 24 Mar 2017 01:23:41 GMT
Jinfeng Ni created DRILL-5378:
---------------------------------

             Summary: Put more information into SchemaChangeException when HashJoin hit SchemaChangeException
                 Key: DRILL-5378
                 URL: https://issues.apache.org/jira/browse/DRILL-5378
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators
            Reporter: Jinfeng Ni
            Assignee: Jinfeng Ni
            Priority: Minor


HashJoin currently does not allow schema change in either build side or probe side. When HashJoin
hit SchemaChangeException in the middle of execution, Drill reports a brief error message
about SchemaChangeException, without providing any information what schemas are in the incoming
batches. That makes hard to analyze the error, and understand what's going on. 

It probably makes sense to put the two differing schemas in the error message, so that user
could get better idea about the schema change. 
Before Drill can provide support for schema change in HashJoin, the detailed error message
would help user debug error. 




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