[jira] [Created] (SPARK-28724) Throw error message when cast out range decimal to long

[ShuMing Li (JIRA)]

ShuMing Li created SPARK-28724:
----------------------------------

             Summary: Throw error message when cast out range decimal to long
                 Key: SPARK-28724
                 URL: https://issues.apache.org/jira/browse/SPARK-28724
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: ShuMing Li


Maybe this is a bug in `Scala` when convert `BigDecimal` to `Long`, however 
Spark should keep the result correct when query the sqls below:
{code:java}
spark-sql> select cast(20190801002382000052000000017638 as int);
-1493203738

spark-sql> select cast(20190801002382000052000000017638 as bigint);
4671677505944388838

{code}
After this patch, the result is below:
{code:java}
spark-sql> select cast(20190801002382000052000000017638 as bigint);

java.lang.ArithmeticException: Decimal 20190801002382000052000000017638 does 
not fit in range [-9223372036854775808, 9223372036854775807] for type Long
at org.apache.spark.sql.types.Decimal.toLong(Decimal.scala:219){code}
 

For `toFloat/toDouble`, the result is reasonable:
{code:java}
spark-sql> select cast(201908010023820000520000000176380000000000000000.0 as 
double);
Error in query: DecimalType can only support precision up to 38 == SQL == 
select cast(201908010023820000520000000176380000000000000000.0 as double)

spark-sql> select cast(201908010023820000520000000176380000000000000000.0 as 
float); Error in query: DecimalType can only support precision up to 38 == SQL 
== select cast(201908010023820000520000000176380000000000000000.0 as float)
{code}
 

 



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