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https://issues.apache.org/jira/browse/DRILL-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880167#comment-16880167
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ASF GitHub Bot commented on DRILL-4163:
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vvysotskyi commented on issue #292: DRILL-4163 Schema changes support in
MergeJoin Operator.
URL: https://github.com/apache/drill/pull/292#issuecomment-509162619
Merged into Apache master with commit id
cc9175c13270660ffd9ec2ddcbc70780dd72dada.
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> 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
> Priority: Major
> 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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