Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/8409#issuecomment-134483133
If you change `MAX_SCALE`, we are changing the maximum scale we can
support, right? I feel the right solution is fixing
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/types/DecimalType.scala#L143
(if the calculated precision is greater than 38, we set it to 38 and then we
adjust scale accordingly to prevent integral part of the number from being
truncated). @davies what do you think?
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