cloud-fan commented on a change in pull request #34729:
URL: https://github.com/apache/spark/pull/34729#discussion_r787391646



##########
File path: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/MathExpressionsSuite.scala
##########
@@ -705,6 +818,42 @@ class MathExpressionsSuite extends SparkFunSuite with 
ExpressionEvalHelper {
     checkEvaluation(BRound(-3.5, 0), -4.0)
     checkEvaluation(BRound(-0.35, 1), -0.4)
     checkEvaluation(BRound(-35, -1), -40)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(2.5), Literal(0)))), 2L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(3.5), Literal(0)))), 3L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(-2.5), Literal(0)))), -3L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(-3.5), Literal(0)))), -4L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(-0.35), Literal(1)))), -0.4)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(-35), Literal(-1)))), -40L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(2.5), Literal(0)))), 3L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(3.5), Literal(0)))), 4L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(-2.5), Literal(0)))), -2L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(-3.5), Literal(0)))), -3L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(-0.35), Literal(1)))), -0.3)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(-35), Literal(-1)))), -30L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(-0.1), Literal(0)))), -1L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(5), Literal(0)))), 5L)
+    checkEvaluation(checkDataTypeAndCast(
+      FloorExpressionBuilder.build(Seq(Literal(3.1411), Literal(-3)))), 0L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(-0.1), Literal(0)))), 0L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(5), Literal(0)))), 5L)
+    checkEvaluation(checkDataTypeAndCast(
+      CeilExpressionBuilder.build(Seq(Literal(3.1411), Literal(-3)))), 1000L)

Review comment:
       Something similar, but we shouldn't add cast on our own. We should rely 
on the framework
   ```
   if (scaleV.asInstanceOf[Int] == 0) {
     Ceil(child)
   } else {
     RoundCeil(child, scale)
   }
   ...
   case class RoundCeil ... {
     def inputTypes = Seq(DecimalType, IntegerType)
     def dataType = child.dataType match {
       case DecimalType.Fixed(p, s) =>
         if (scale < 0) {
           DecimalType(math.max(p, 1 - scale), 0)
         } else {
           DecimalType(p, math.min(s, scale))
         }
     }
   }
   ```




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