Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7605#discussion_r35353268
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/DecimalType.scala ---
@@ -36,7 +36,7 @@ case class PrecisionInfo(precision: Int, scale: Int) {
/**
* :: DeveloperApi ::
* The data type representing `java.math.BigDecimal` values.
- * A Decimal that might have fixed precision and scale, or unlimited
values for these.
+ * A Decimal that must have fixed precision and scale.
--- End diff --
define the maximum and default here
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