[jira] [Created] (SPARK-8342) Decimal Math beyond ~2^112 is broken

["Rene Treffer (JIRA)" <ji...@apache.org>]

Rene Treffer created SPARK-8342:
-----------------------------------

             Summary: Decimal Math beyond ~2^112 is broken
                 Key: SPARK-8342
                 URL: https://issues.apache.org/jira/browse/SPARK-8342
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.5.0
            Reporter: Rene Treffer


Here is a snippet from the spark-shell that should not happen

{code}
scala> val d = Decimal(Long.MaxValue,100,0) * Decimal(Long.MaxValue,100,0)
d: org.apache.spark.sql.types.Decimal = 0
scala> d.toDebugString
res3: String = Decimal(expanded,0,1,0})
{code}

It looks like precision gets reseted on some operations and values are then truncated.



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