Github user JihongMA commented on the pull request:
https://github.com/apache/spark/pull/7056#issuecomment-118171474
@viirya I have opened a JIRA
https://issues.apache.org/jira/browse/SPARK-8800, and have put more detailed
specification I found how to handle decimal division in the case of
Decimal.Unlimited type. I propose we should return exact result whenever
possible, in the case of infinite long precision/scale case, fall back to the
limit 38 or whatever as what hive has done.
here is another example where we should return 0.125 instead of 0
scala> val aa = Decimal(1) /Decimal(8)
aa: org.apache.spark.sql.types.Decimal = 0
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