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https://issues.apache.org/jira/browse/SPARK-37387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17446365#comment-17446365
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Zhen Wang commented on SPARK-37387:
-----------------------------------
[~yoda-mon] what is the use case behind, random doesn't seem justify your usage
> Allow nondeterministic expression in aggregate function
> -------------------------------------------------------
>
> Key: SPARK-37387
> URL: https://issues.apache.org/jira/browse/SPARK-37387
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Leona Yoda
> Priority: Minor
>
> Nondeterministic expression in aggregate function is not allow in spark, so
> we cannot execute query like
> {code:java}
> SELECT COUNT(RANDOM());
> {code}
> and raise \{{nondeterministic expression ... should not appear in the
> arguments of an aggregate function. }}error message.
> [related code
> section|https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala#L298]
>
> Hence other DB like PostgreSQL, we can call the SQL.
> {code:java}
> postgres=# SELECT COUNT(RANDOM());
> count
> -------
> 1
> (1 row) {code}
>
> I tried to remove the error message section, then I found spark could execute
> the query.
> {code:java}
> scala> spark.sql("SELECT COUNT(RANDOM())").show()
> +-------------+
> |count(rand())|
> +-------------+
> | 1|
> +-------------+ {code}
>
> It could be useful for spark users to be able to execute those kinds of
> queries because they can simply call
> {code:java}
> spark.sql("SELECT COUNT(DISTINCT(INPUT_FILE_NAME())) FROM table WHERE ...")
> {code}
> to find target files, for example.
>
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