Keuntae Park created TAJO-1513:
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Summary: Supporting set operations
Key: TAJO-1513
URL: https://issues.apache.org/jira/browse/TAJO-1513
Project: Tajo
Issue Type: New Feature
Reporter: Keuntae Park
Currently, Tajo only supports union all operation.
It needs to support
{code}
query1 UNION [ALL] query2
query1 INTERSECT [ALL] query2
query1 EXCEPT [ALL] query2
{code}
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