cloud-fan commented on a change in pull request #34729:
URL: https://github.com/apache/spark/pull/34729#discussion_r773031707
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala
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@@ -249,9 +249,9 @@ case class Cbrt(child: Expression) extends
UnaryMathExpression(math.cbrt, "CBRT"
""",
since = "1.4.0",
group = "math_funcs")
-case class Ceil(child: Expression) extends UnaryMathExpression(math.ceil,
"CEIL") {
+ case class Ceil(child: Expression) extends UnaryMathExpression(math.ceil,
"CEIL") {
override def dataType: DataType = child.dataType match {
Review comment:
It doesn't matter how we implement it. The problem is we don't have a
clear answer for the return type of `ceil(c_double, null)`. `ceil(c_double, 1)`
returns double, `ceil(c_double, -1)` returns long, I don't think either long or
double makes sense for `ceil(c_double, null)`.
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