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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