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https://issues.apache.org/jira/browse/CALCITE-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17367021#comment-17367021
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duan xiong commented on CALCITE-1473:
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CALCITE-4661 is a sub-task dealing with MODE. I will working on 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
> Priority: Major
>
> 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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