[jira] [Created] (SPARK-8802) Decimal.apply(BigDecimal).toBigDecimal may throw NumberFormatException

["Josh Rosen (JIRA)" <ji...@apache.org>]

Josh Rosen created SPARK-8802:
---------------------------------

             Summary: Decimal.apply(BigDecimal).toBigDecimal may throw NumberFormatException
                 Key: SPARK-8802
                 URL: https://issues.apache.org/jira/browse/SPARK-8802
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.5.0
            Reporter: Josh Rosen
            Assignee: Josh Rosen
            Priority: Minor


There exist certain BigDecimals that can be converted into Spark SQL's Decimal class but which produce Decimals that cannot be converted back to BigDecimal without throwing NumberFormatException.

For instance:

{code}
val x = BigDecimal(BigInt("18889465931478580854784"), -2147483648)
assert(Decimal(x).toBigDecimal === x)
{code}

will fail with an exception:

{code}
java.lang.NumberFormatException
	at java.math.BigDecimal.<init>(BigDecimal.java:511)
	at java.math.BigDecimal.<init>(BigDecimal.java:757)
	at scala.math.BigDecimal$.apply(BigDecimal.scala:119)
	at scala.math.BigDecimal.apply(BigDecimal.scala:324)
	at org.apache.spark.sql.types.Decimal.toBigDecimal(Decimal.scala:142)
	at org.apache.spark.sql.types.decimal.DecimalSuite$$anonfun$2.apply$mcV$sp(DecimalSuite.scala:62)
	at org.apache.spark.sql.types.decimal.DecimalSuite$$anonfun$2.apply(DecimalSuite.scala:60)
	at org.apache.spark.sql.types.decimal.DecimalSuite$$anonfun$2.apply(DecimalSuite.scala:60)
{code}



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