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Posted to issues@spark.apache.org by "Dongjoon Hyun (JIRA)" <ji...@apache.org> on 2016/04/15 19:56:25 UTC
[jira] [Created] (SPARK-14664) Fix DecimalAggregates optimizer not
to break Window queries
Dongjoon Hyun created SPARK-14664:
-------------------------------------
Summary: 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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