[jira] [Created] (TAJO-680) Improve the IN operator to support sub queries

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

Jihoon Son created TAJO-680:
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             Summary: Improve the IN operator to support sub queries
                 Key: TAJO-680
                 URL: https://issues.apache.org/jira/browse/TAJO-680
             Project: Tajo
          Issue Type: Improvement
          Components: distributed query plan, parser
            Reporter: Jihoon Son
             Fix For: 1.0-incubating


Currently, the IN operator can be used with only sets of values.
We need to improve it to support sub queries as the following example query.
{noformat}
tajo> select * from nation where n_regionkey in (select r_regionkey from region); 
{noformat}



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