Jinfeng Ni created DRILL-847:
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Summary: Merging Receiver requires to canonicalize schemas of
input batches
Key: DRILL-847
URL: https://issues.apache.org/jira/browse/DRILL-847
Project: Apache Drill
Issue Type: Bug
Reporter: Jinfeng Ni
Assignee: Jinfeng Ni
The Merge Receivers assumes all the incoming batches have the same schemas. If
the incoming batches happen to have different schemas, the run-time generated
code for merge receiver would not be able to handle the different schemas, and
could throw ClassCast Exception.
To fix it, we need canonicalize the schemas of incoming batches for merge
receiver. If the schemas are still different after this step, Merge Receiver
would throw exception.
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