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

["Suresh Ollala (JIRA)" <ji...@apache.org>]

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

Suresh Ollala updated DRILL-4163:
---------------------------------
    Reviewer: Khurram Faraaz  (was: Victoria Markman)

> 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: Jason Altekruse
>             Fix For: 1.5.0
>
>
> Since external sort operator supports schema changes, allow use of union types in merge join to 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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