[
https://issues.apache.org/jira/browse/CALCITE-4763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17417252#comment-17417252
]
Xurenhe edited comment on CALCITE-4763 at 9/18/21, 11:05 PM:
-------------------------------------------------------------
[~julianhyde] Thanks for your very detailed descriptions.
My original intention just is that
`org.apache.calcite.sql.SqlAggFunction#getDistinctOptionality` should return
`org.apache.calcite.util.Optionality#IGNORED`:)
was (Author: wojustme):
[~julianhyde] Thanks for your very detailed descriptions.
My original intention just is that
`org.apache.calcite.sql.SqlAggFunction#getDistinctOptionality` return return
`org.apache.calcite.util.Optionality#IGNORED`
> add EXISTS_AGG aggregate function
> ---------------------------------
>
> Key: CALCITE-4763
> URL: https://issues.apache.org/jira/browse/CALCITE-4763
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: duan xiong
> Priority: Major
>
> Add {{EXISTS_AGG}}, an aggregate function that returns whether count is
> greater than zero.
> Thus {{EXISTS_AGG\(\*)}} is equivalent to {{COUNT\(\*) > 0}}, and
> {{EXISTS_AGG(c)}} is equivalent to {{COUNT(c) > 0}}.
> {{EXISTS_AGG}} would mainly be of use internally. Since it produces a
> {{BOOLEAN}} value, we can use the value directly from an {{Aggregate}}
> without an intervening {{Project}}. It also captures the fact that we don't
> care how many rows were produced.
> See also {{TRUE_AGG}}, CALCITE-4334.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
