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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