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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-18170) Confusing error message when using rangeBetween without specifying an "orderBy"
Date Mon, 09 Oct 2017 11:41:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-18170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16196839#comment-16196839
] 

Hyukjin Kwon commented on SPARK-18170:
--------------------------------------

{code}
org.apache.spark.sql.AnalysisException: cannot resolve '(RANGE BETWEEN CURRENT ROW AND 1L
FOLLOWING)' due to data type mismatch: A range window frame cannot be used in an unordered
window specification.;;
'Project [sum(id#0L) windowspecdefinition(specifiedwindowframe(RangeFrame, currentrow$(),
1)) AS sum(id) OVER (RANGE BETWEEN CURRENT ROW AND 1 FOLLOWING)#4]
+- Range (1, 3, step=1, splits=Some(8))
{code}

Looks it throws an different message now in the current master. 

> Confusing error message when using rangeBetween without specifying an "orderBy"
> -------------------------------------------------------------------------------
>
>                 Key: SPARK-18170
>                 URL: https://issues.apache.org/jira/browse/SPARK-18170
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Weiluo Ren
>            Priority: Minor
>
> {code}
> spark.range(1,3).select(sum('id) over Window.rangeBetween(0,1)).show
> {code}
> throws runtime exception:
> {code}
> Non-Zero range offsets are not supported for windows with multiple order expressions.
> {code}
> which is confusing in this case because we don't have any order expression here.
> How about add a check on
> {code}
> orderSpec.isEmpty
> {code}
> at https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExec.scala#L141
> and throw an exception saying "no order expressions is specified"?



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