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https://issues.apache.org/jira/browse/DRILL-3991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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amit hadke reassigned DRILL-3991:
---------------------------------
Assignee: amit hadke
> Support schema changes in hash join operator
> --------------------------------------------
>
> Key: DRILL-3991
> URL: https://issues.apache.org/jira/browse/DRILL-3991
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: amit hadke
> Assignee: amit hadke
>
> Hash join should be able to support schema changes during execution.
> It should resolve edge cases when join columns are missing.
> Example:
> |Table A | Table B|
> | k1 v1 | k2 v2|
> | 1 "a" | "2" "b"|
> | 2 "b" | 1 "a"|
> | 2.0 "b" | 2.0 "b"|
> | 3 "c" | |
>
> A INNER JOIN B on A.k1=B.k2
> |k1 | v1 | k2| v2|
> | 1 | "a" | 1 | "a" |
> | 2 | "b" | 2.0 | "b" |
> | 2.0 | "b" | 2.0 | "b" |
> Where in output
>
> k1 is of union type (INTEGER, DOUBLE)
> k2 is of union type (INTEGER, DOUBLE, VARCHAR)
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