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Posted to issues@drill.apache.org by "amit hadke (JIRA)" <ji...@apache.org> on 2015/10/28 19:35:27 UTC
[jira] [Created] (DRILL-3991) Support schema changes in hash join
operator
amit hadke created DRILL-3991:
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Summary: 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
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.key=B.key
k1 v1 k2 v2
1 "a" 1 "a"
2 "b" 2.0 "b"
2.0 "b" 2.0 "b"
Where in output
k1 is a union type (INTEGER, DOUBLE)
k2 is a union type (INTEGER, DOUBLE, VARCHAR)
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