Dominic Ricard created SPARK-20581:
--------------------------------------
Summary: Using AVG or SUM on a INT/BIGINT column with fraction
operator will yield BIGINT instead of DOUBLE
Key: SPARK-20581
URL: https://issues.apache.org/jira/browse/SPARK-20581
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.2
Reporter: Dominic Ricard
We stumbled on this multiple times and every time we are baffled by the
behavior of AVG and SUM.
Given the following SQL (Executed through Thrift):
{noformat}
SELECT SUM(col/2) FROM
(SELECT 3 as `col`) t
{noformat}
The result will be "1", when the expected and accurate result is 1.5
Here's the explain plan:
{noformat}
== Physical Plan ==
TungstenAggregate(key=[], functions=[(sum(cast((cast(col#1519342 as double) /
2.0) as bigint)),mode=Final,isDistinct=false)], output=[_c0#1519344L])
+- TungstenExchange SinglePartition, None
+- TungstenAggregate(key=[], functions=[(sum(cast((cast(col#1519342 as
double) / 2.0) as bigint)),mode=Partial,isDistinct=false)],
output=[sum#1519347L])
+- Project [3 AS col#1519342]
+- Scan OneRowRelation[]
{noformat}
Why the extra cast to BIGINT?
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
