Github user travishegner commented on the pull request: https://github.com/apache/spark/pull/8780#issuecomment-142100699 OK, after looking at this a little further, it seems that DecimalType.bounded() should be called regardless of precision and scale values in JDBCRDD.scala, and then let the .bounded() method validate the precision and scale values. If it finds invalid values, it can return defaults, or throw an exception, depending on which condition is met. I'm going to move in that direction for this. I'm still a little confused by the precision and scale rules that you defined. Wouldn't it be invalid to have a precision = 10, but a scale = -20? Wouldn't that always result in a null value, or am I still completely interpreting precision and scale incorrectly?
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