[jira] [Created] (CALCITE-1473) Ordered-set and hypothetical-set aggregate functions

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-1473:
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             Summary: Ordered-set and hypothetical-set aggregate functions
                 Key: CALCITE-1473
                 URL: https://issues.apache.org/jira/browse/CALCITE-1473
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


Support ordered-set and hypothetical-set aggregate functions. Both have a WITHIN GROUP clause. These are supported by Oracle, PostgreSQL, Microsoft SQL Server.

Examples of ordered-set aggregate functions are {{mode}}, {{percentile_cont}}, {{percentile_disc}}. See [PostgreSQL doc|https://www.postgresql.org/docs/9.5/static/functions-aggregate.html#FUNCTIONS-ORDEREDSET-TABLE].

Examples of hypothetical-set aggregate functions are {{rank}}, {{dense_rank}}, {{percent_rank}}, {{cume_dist}}. See [PostgreSQL doc|https://www.postgresql.org/docs/9.5/static/functions-aggregate.html#FUNCTIONS-HYPOTHETICAL-TABLE].

The SQL standard says (in section 4.16.4 Aggregate Functions):

{quote}The hypothetical set functions are related to the window functions RANK, DENSE_RANK, PERCENT_RANK, and CUME_DIST, and use the same names, though with a different syntax.{quote}



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