[jira] [Assigned] (SPARK-14664) Fix DecimalAggregates optimizer not to break Window queries

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-14664:
------------------------------------

    Assignee: 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
>            Assignee: Apache Spark
>            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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