AngersZhuuuu commented on a change in pull request #31509:
URL: https://github.com/apache/spark/pull/31509#discussion_r571802245
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
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@@ -269,3 +269,62 @@ case class TypeOf(child: Expression) extends
UnaryExpression {
defineCodeGen(ctx, ev, _ =>
s"""UTF8String.fromString(${child.dataType.catalogString})""")
}
}
+
+@ExpressionDescription(
+ usage = """_FUNC_(expr) - Execute all children and return the last child
result.""",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(1, 2);
+ 2
+ > SELECT _FUNC_(1 + 2, 3 + 4);
+ 7
+ """,
+ since = "3.2.0",
+ group = "misc_funcs")
+case class DelegateFunction(children: Seq[Expression]) extends Expression {
+ require(children.nonEmpty, s"$prettyName function requires children is not
empty.")
+
+ private lazy val lastChild = children.last
+
+ override lazy val deterministic: Boolean = children.forall(_.deterministic)
+ override lazy val resolved: Boolean = children.forall(_.resolved)
+ override def foldable: Boolean = children.forall(_.foldable)
+ override def nullable: Boolean = lastChild.nullable
+ override def dataType: DataType = lastChild.dataType
+
+ override def eval(input: InternalRow): Any = {
+ var result: Any = null
+ children.foreach { child =>
+ result = child.eval(input)
+ }
+ result
Review comment:
Hmmm how about add a result map and avoid re-compute same child?
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