[
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
