Keuntae Park created TAJO-1518:
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Summary: Implement EXCEPT
Key: TAJO-1518
URL: https://issues.apache.org/jira/browse/TAJO-1518
Project: Tajo
Issue Type: Sub-task
Reporter: Keuntae Park
{code}
query1 EXCEPT [ALL] query2
{code}
EXCEPT returns all rows that are in the result of query1 but not in the result
of query2.
Duplicates are eliminated unless EXCEPT ALL is used.
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