[jira] [Created] (DRILL-2174) Flatten should work from within a filter

["Rahul Challapalli (JIRA)" <ji...@apache.org>]

Rahul Challapalli created DRILL-2174:
----------------------------------------

             Summary: Flatten should work from within a filter
                 Key: DRILL-2174
                 URL: https://issues.apache.org/jira/browse/DRILL-2174
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Relational Operators
            Reporter: Rahul Challapalli
            Assignee: Chris Westin


git.commit.id.abbrev=3e33880

We should be able to use flatten from within a filter when the output of flatten is scalars.

Currently we can use flatten with order by and group by operators (when the output of flatten is scalars).

Data Set :
{code}
{
  "id" : 1,
  "lst" : [1,2,3]
}
{code}

The below queries work :
{code}
select d.id from `temp.json` d order by flatten(d.lst);
select MAX(d.id) from `temp.json` d group by flatten(d.lst);
{code}

The below query fails :
{code}
select d.uid from `temp.json` d where flatten(d.lst) > 5;
{code}



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