Marco Gaido created SPARK-28610:
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Summary: Support larger buffer for sum of long
Key: SPARK-28610
URL: https://issues.apache.org/jira/browse/SPARK-28610
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Marco Gaido
The sum of a long field currently uses a buffer of type long.
When the flag for throwing exceptions on overflow for arithmetic operations in
turned on, this is a problem in case there are intermediate overflows which are
then resolved by other rows. Indeed, in such a case, we are throwing an
exception, while the result is representable in a long value. An example of
this issue can be seen running:
{code}
val df = sc.parallelize(Seq(100L, Long.MaxValue, -1000L)).toDF("a")
df.select(sum($"a")).show()
{code}
According to [~cloud_fan]'s suggestion in
https://github.com/apache/spark/pull/21599, we should introduce a flag in order
to let users choose among a wider datatype for the sum buffer using a config,
so that the above issue can be fixed.
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