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From "Xiao Li (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-27986) Support Aggregate Expressions with filter
Date Wed, 09 Oct 2019 16:23:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-27986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947822#comment-16947822
] 

Xiao Li commented on SPARK-27986:
---------------------------------

There is a blog to describe this feature too. [https://blog.jooq.org/2014/12/30/the-awesome-postgresql-9-4-sql2003-filter-clause-for-aggregate-functions/]

> Support Aggregate Expressions with filter
> -----------------------------------------
>
>                 Key: SPARK-27986
>                 URL: https://issues.apache.org/jira/browse/SPARK-27986
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Yuming Wang
>            Priority: Major
>
> An aggregate expression represents the application of an aggregate function across the
rows selected by a query. An aggregate function reduces multiple inputs to a single output
value, such as the sum or average of the inputs. The syntax of an aggregate expression is
one of the following:
> {noformat}
> aggregate_name (expression [ , ... ] [ order_by_clause ] ) [ FILTER ( WHERE filter_clause
) ]
> aggregate_name (ALL expression [ , ... ] [ order_by_clause ] ) [ FILTER ( WHERE filter_clause
) ]
> aggregate_name (DISTINCT expression [ , ... ] [ order_by_clause ] ) [ FILTER ( WHERE
filter_clause ) ]
> aggregate_name ( * ) [ FILTER ( WHERE filter_clause ) ]
> aggregate_name ( [ expression [ , ... ] ] ) WITHIN GROUP ( order_by_clause ) [ FILTER
( WHERE filter_clause ) ]{noformat}
> [https://www.postgresql.org/docs/current/sql-expressions.html#SYNTAX-AGGREGATES]
>  



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