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From "amit hadke (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DRILL-4163) Support schema changes for MergeJoin operator.
Date Fri, 18 Dec 2015 21:31:46 GMT

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

amit hadke closed DRILL-4163.
-----------------------------
    Resolution: Fixed

> 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 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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