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https://issues.apache.org/jira/browse/SPARK-28500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891833#comment-16891833
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Dylan Guedes commented on SPARK-28500:
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Hmm you are correct, there's some overlapping there. However, at some point the
JIRA will be fragmented into smaller ones, like one for filter, other for
distinct, right?
> adds support for `filter` clause
> --------------------------------
>
> Key: SPARK-28500
> URL: https://issues.apache.org/jira/browse/SPARK-28500
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Dylan Guedes
> Priority: Major
>
> Definition: "The {{filter}} clause extends aggregate functions ({{sum}},
> {{avg}}, {{count}}, …) by an additional {{where}} clause. The result of the
> aggregate is built from only the rows that satisfy the additional {{where}}
> clause too." [source|[https://modern-sql.com/feature/filter]]
> Also, PgSQL currently support `filter` while Spark doesn't.
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