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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2018/06/17 17:08:00 UTC
[jira] [Commented] (SPARK-24575) Prohibit window expressions inside
WHERE and HAVING clauses
[ https://issues.apache.org/jira/browse/SPARK-24575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16515141#comment-16515141 ]
Apache Spark commented on SPARK-24575:
--------------------------------------
User 'aokolnychyi' has created a pull request for this issue:
https://github.com/apache/spark/pull/21580
> Prohibit window expressions inside WHERE and HAVING clauses
> -----------------------------------------------------------
>
> Key: SPARK-24575
> URL: https://issues.apache.org/jira/browse/SPARK-24575
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Anton Okolnychyi
> Priority: Minor
> Fix For: 2.4.0
>
>
> Why window functions inside WHERE and HAVING clauses should be prohibited is described [here|https://stackoverflow.com/questions/13997177/why-no-windowed-functions-in-where-clauses].
> Spark, on the other hand, does not handle this explicitly and will fail with non-descriptive exceptions.
> {code}
> val df = Seq((1, 2), (1, 3), (2, 4), (5, 5)).toDF("a", "b")
> df.createTempView("t1")
> spark.sql("SELECT t1.a FROM t1 WHERE RANK() OVER(ORDER BY t1.b) = 1").show(false)
> {code}
> {noformat}
> Exception in thread "main" java.lang.UnsupportedOperationException: Cannot evaluate expression: rank(input[1, int, false]) windowspecdefinition(input[1, int, false] ASC NULLS FIRST, specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$()))
> at org.apache.spark.sql.catalyst.expressions.Unevaluable$class.doGenCode(Expression.scala:261)
> at org.apache.spark.sql.catalyst.expressions.WindowExpression.doGenCode(windowExpressions.scala:278)
> at org.apache.spark.sql.catalyst.expressions.Expression$$anonfun$genCode$2.apply(Expression.scala:108)
> at org.apache.spark.sql.catalyst.expressions.Expression$$anonfun$genCode$2.apply(Expression.scala:105)
> at scala.Option.getOrElse(Option.scala:121)
> ...
> {noformat}
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