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

["Rajeshbabu Chintaguntla (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948799#comment-15948799 ] 

Rajeshbabu Chintaguntla commented on CALCITE-1473:
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[~julianhyde] I will take up this.

> 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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