[ https://issues.apache.org/jira/browse/SPARK-27986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947816#comment-16947816
]
Xiao Li commented on SPARK-27986:
---------------------------------
cc [~beliefer]
> 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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