[
https://issues.apache.org/jira/browse/FLINK-5315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571365#comment-16571365
]
Fabian Hueske commented on FLINK-5315:
--------------------------------------
Hi [~walterddr] and [~hequn8128], Thanks for the discussion!
I agree with [~hequn8128]. {{Table.distinct}} is different from
{{agg.distinct('a, 'b)}} or {{'a.agg.distinct}}.
In fact, {{Table.distinct}} is a separate operator and not related to
{{Table.select()}}.
I would leave {{Table.distinct}} as it is and stick to this proposal
{code}
'a.count.distinct
myUdagg.distinct('a)
multiParamAgg.distinct('a, 'b)
{code}
> Support distinct aggregations in table api
> ------------------------------------------
>
> Key: FLINK-5315
> URL: https://issues.apache.org/jira/browse/FLINK-5315
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Kurt Young
> Assignee: Rong Rong
> Priority: Major
>
> Support distinct aggregations in Table API in the following format:
> For Expressions:
> {code:scala}
> 'a.count.distinct // Expressions distinct modifier
> {code}
> For User-defined Function:
> {code:scala}
> singleArgUdaggFunc.distinct('a) // FunctionCall distinct modifier
> multiArgUdaggFunc.distinct('a, 'b) // FunctionCall distinct modifier
> {code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
