[jira] [Created] (TAJO-1683) Improve join order optimization of a query involving multiple commutative joins and non-commutative joins

["Jihoon Son (JIRA)" <ji...@apache.org>]

Jihoon Son created TAJO-1683:
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             Summary: Improve join order optimization of a query involving multiple commutative joins and non-commutative joins
                 Key: TAJO-1683
                 URL: https://issues.apache.org/jira/browse/TAJO-1683
             Project: Tajo
          Issue Type: Improvement
          Components: planner/optimizer
            Reporter: Jihoon Son


TAJO-1352 is the issue to improve our join order optimization, but has a limitation. That is, when a query involves multiple commutative joins and non-commutative joins, the join order of commutative joins is fixed in an order of in an order of their occurrences in the query without optimization process. 
This should be improved because the response time of a query will be highly increased due to the suboptimal join order as the query involves multiple joins.



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