Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7605#issuecomment-124336161
@rxin Actually (38, 18) is not the maximum one, (38, 38) may be. (10, 0)
is the default one when user define a schema, (38, 18) is the one when we infer
the type from BigDecimal, or other cases that we use it as default one
internally, because it has balanced precision on range (left side) and scale
(right side). The names is borrowed from Hive, I found them make more sense
than DEFAULT and MAXIMUM.
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