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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