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  1. Apache Arrow
  2. ARROW-11431

[Rust] [DataFusion] Add support for the SQL HAVING clause

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      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:

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

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

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

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

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

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

      SELECT MAX(c1) FROM t HAVING MAX(c1) > 100
      

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              drusso Daniel Russo
              drusso Daniel Russo
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