[
https://issues.apache.org/jira/browse/CALCITE-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17367456#comment-17367456
]
Julian Hyde commented on CALCITE-4661:
--------------------------------------
Why does PostgreSQL require the values of {{MODE}} to be sorted? I understand
why {{PERCENTILE_CONT}} etc. require sorting. But one should be able to apply
{{MODE}} to a [categorical
variable|https://en.wikipedia.org/wiki/Categorical_variable] such as a person's
blood type (A, AB, or O), which is not inherently ordered.
Do other databases require sorting? Should Calcite require sorting?
> Add MODE aggregate functions
> ----------------------------
>
> Key: CALCITE-4661
> URL: https://issues.apache.org/jira/browse/CALCITE-4661
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: duan xiong
> Assignee: duan xiong
> Priority: Major
>
> Add MODE functions in the operator table which returns the most frequent
> input value (arbitrarily choosing the first one if there are multiple
> equally-frequent results)
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
