Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18244#discussion_r121063884
  
    --- 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 --
    
    Don't we allow the case that precision equals to scale? Seems it works for 
the example expressions.
    
        scala> sql("select floor(0.9)").show()
        +----------+
        |FLOOR(0.9)|
        +----------+
        |         0|
        +----------+
    
    
        scala> sql("select ceil(0.9)").show()
        +---------+
        |CEIL(0.9)|
        +---------+
        |        1|
        +---------+
    
    
        scala> sql("select 1 > 0.9").show()
        +-----------------------+
        |(CAST(1 AS BIGINT) > 0)|
        +-----------------------+
        |                   true|
        +-----------------------+



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