Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18244#discussion_r121180182
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala ---
@@ -126,7 +126,15 @@ final class Decimal extends Ordered[Decimal] with
Serializable {
def set(decimal: BigDecimal): Decimal = {
this.decimalVal = decimal
this.longVal = 0L
- this._precision = decimal.precision
+ if (decimal.compare(BigDecimal(1.0)) == -1 &&
decimal.compare(BigDecimal(-1.0)) == 1) {
--- End diff --
We should still allow the case in which the precision equals to the scale.
In the traditional database, `.99`'s precision is 2 and scale is 2; but
`0.99`'s precision is 3 and scale is 2
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