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https://issues.apache.org/jira/browse/SPARK-14664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-14664:
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Assignee: (was: Apache Spark)
> Fix DecimalAggregates optimizer not to break Window queries
> -----------------------------------------------------------
>
> Key: SPARK-14664
> URL: https://issues.apache.org/jira/browse/SPARK-14664
> Project: Spark
> Issue Type: Bug
> Components: Optimizer
> Reporter: Dongjoon Hyun
> Priority: Critical
>
> Historically, `DecimalAggregates` optimizer is designed to transform general
> `sum/avg(decimal)`.
> However, it breaks recently added windows queries like the followings. The
> following queries work well without this optimizer.
> *Sum*
> {code}
> scala> sql("select sum(a) over () from (select explode(array(1.0,2.0)) a)
> t").head
> java.lang.RuntimeException: Unsupported window function:
> MakeDecimal((sum(UnscaledValue(a#31)),mode=Complete,isDistinct=false),12,1)
> {code}
> *Average*
> {code}
> scala> sql("select avg(a) over () from (select explode(array(1.0,2.0)) a)
> t").head
> java.lang.RuntimeException: Unsupported window function:
> cast(((avg(UnscaledValue(a#40)),mode=Complete,isDistinct=false) / 10.0) as
> decimal(6,5))
> {code}
> This issue aims to fix `DecimalAggregates` optimizer not to handle
> aggregation queries over windows.
> Note that this issue does not aim to implement optimization over Window
> aggregation.
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