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https://issues.apache.org/jira/browse/SPARK-27255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16800130#comment-16800130
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Dilip Biswal commented on SPARK-27255:
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[~chakravarthi] Hello, I had started working on this and hadn't seen your
comment. If you haven't started, can i submit a PR for this and you can help
review ? Please let me know.
> Aggregate functions should not be allowed in WHERE
> --------------------------------------------------
>
> Key: SPARK-27255
> URL: https://issues.apache.org/jira/browse/SPARK-27255
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Mingcong Han
> Priority: Minor
>
> Aggregate functions should not be allowed in WHERE clause. But Spark SQL
> throws an exception when generating codes. It is supposed to throw an
> exception during parsing or analyzing.
> Here is an example:
> {code:scala}
> val df = spark.sql("select * from t where sum(ta) > 0")
> df.explain(true)
> df.show()
> {code}
> Spark SQL explains it as:
> {noformat}
> == Parsed Logical Plan ==
> 'Project [*]
> +- 'Filter ('sum('ta) > 0)
> +- 'UnresolvedRelation `t`
> == Analyzed Logical Plan ==
> ta: int, tb: int
> Project [ta#5, tb#6]
> +- Filter (sum(cast(ta#5 as bigint)) > cast(0 as bigint))
> +- SubqueryAlias `t`
> +- Project [ta#5, tb#6]
> +- SubqueryAlias `as`
> +- LocalRelation [ta#5, tb#6]
> == Optimized Logical Plan ==
> Filter (sum(cast(ta#5 as bigint)) > 0)
> +- LocalRelation [ta#5, tb#6]
> == Physical Plan ==
> *(1) Filter (sum(cast(ta#5 as bigint)) > 0)
> +- LocalTableScan [ta#5, tb#6]
> {noformat}
> But when executing `df.show()`:
> {noformat}
> Exception in thread "main" java.lang.UnsupportedOperationException: Cannot
> generate code for expression: sum(cast(input[0, int, false] as bigint))
> at
> org.apache.spark.sql.catalyst.expressions.Unevaluable.doGenCode(Expression.scala:291)
> at
> org.apache.spark.sql.catalyst.expressions.Unevaluable.doGenCode$(Expression.scala:290)
> at
> org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression.doGenCode(interfaces.scala:87)
> at
> org.apache.spark.sql.catalyst.expressions.Expression.$anonfun$genCode$3(Expression.scala:138)
> at scala.Option.getOrElse(Option.scala:138)
> {noformat}
> I have tried it in PostgreSQL, and it directly throws an error:
> {noformat}
> ERROR: Aggregate functions are not allowed in WHERE.
> {noformat}
> We'd better throw an AnalysisException here.
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