[jira] [Updated] (DRILL-4163) Support schema changes for MergeJoin Operator.

["amit hadke (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

amit hadke updated DRILL-4163:
------------------------------
    Summary: Support schema changes for MergeJoin Operator.  (was: Support schema changes for Merge Join Operator.)

> Support schema changes for MergeJoin Operator.
> ----------------------------------------------
>
>                 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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