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From "amit hadke (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4163) Support Schema changes for Merge Join
Date Fri, 04 Dec 2015 23:55:10 GMT
amit hadke created DRILL-4163:

             Summary: Support Schema changes for Merge Join
                 Key: DRILL-4163
                 URL: https://issues.apache.org/jira/browse/DRILL-4163
             Project: Apache Drill
          Issue Type: Improvement
            Reporter: amit hadke
            Assignee: amit hadke

Since External sort supports schema changes enable use of union types in merge join to allow
support for schema changes.

For now, we assume that merge join always works on record batches from sort operator. Thus
merging schemas and promoting to union vectors is already taken care by sort operator.

Test Cases:
1) Only one side changes schema (join on union type and primitive type)
2) Both sids change schema on all columns.
3) Join between numeric types and string types.
4) Missing columns - each batch has different columns. 

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