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https://issues.apache.org/jira/browse/SPARK-30219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16994102#comment-16994102
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Hyukjin Kwon commented on SPARK-30219:
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[~beliefer] check the comments in its parent JIRA.
> Support Filter expression reference the outer query
> ---------------------------------------------------
>
> Key: SPARK-30219
> URL: https://issues.apache.org/jira/browse/SPARK-30219
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: jiaan.geng
> Priority: Major
>
> Spark SQL cannot supports a SQL with nested aggregate as below:
>
> {code:java}
> select (select count(*) filter (where outer_c <> 0)
> from (values (1)) t0(inner_c))
> from (values (2),(3)) t1(outer_c);{code}
>
> And Spark will throw exception as follows:
> {code:java}
> org.apache.spark.sql.AnalysisException
> Expressions referencing the outer query are not supported outside of
> WHERE/HAVING clauses:
> Aggregate [count(1) AS count(1)#xL]
> +- Project [col1#x AS inner_c#x]
> +- SubqueryAlias `t0`
> +- LocalRelation [col1#x]{code}
> But PostgreSQL supports this syntax.
>
> {code:java}
> select (select count(*) filter (where outer_c <> 0)
> from (values (1)) t0(inner_c))
> from (values (2),(3)) t1(outer_c); -- outer query is aggregation query
> count
> -------
> 2
> (1 row){code}
>
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