[jira] [Created] (ARROW-11431) [Rust] [DataFusion] Add support for the SQL HAVING clause

["Daniel Russo (Jira)" <ji...@apache.org>]

Daniel Russo created ARROW-11431:
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             Summary: [Rust] [DataFusion] Add support for the SQL HAVING clause
                 Key: ARROW-11431
                 URL: https://issues.apache.org/jira/browse/ARROW-11431
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Rust - DataFusion
            Reporter: Daniel Russo
            Assignee: Daniel Russo


We do not yet have support for the SQL {{HAVING}} clause. {{HAVING}} is used to filter post-aggregation, typically against an aggregated column. For example:

{code}
SELECT c1, MAX(c2) FROM t GROUP BY c1 HAVING MAX(c2) > 100
{code}

{{HAVING}} expressions need not reference aggregates in the {{SELECT}}, for example:

{code}
SELECT c1, MAX(c2) FROM t GROUP BY c1 HAVING MIN(c2) > 100
{code}

{{HAVING}} expressions need not filter on aggregated columns, for example:

{code}
SELECT c1, MAX(c2) FROM t GROUP BY c1 HAVING c1 > 100
{code}

Lastly, {{HAVING}} expressions need not be used in conjunction with a {{GROUP BY}}, for example: 

{code}
SELECT MAX(c1) FROM t HAVING MAX(c1) > 100
{code}



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