maropu commented on a change in pull request #28420:
URL: https://github.com/apache/spark/pull/28420#discussion_r418420802
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
##########
@@ -323,6 +323,20 @@ trait RuntimeReplaceable extends UnaryExpression with
Unevaluable {
// two `RuntimeReplaceable` are considered to be semantically equal if their
"child" expressions
// are semantically equal.
override lazy val canonicalized: Expression = child.canonicalized
+
+ override def innerChildren: Seq[Expression] = sys.error("RuntimeReplaceable
must implement" +
+ " innerChildren with the original parameters")
+
+ protected val sqlStrSeparator: String = ", "
+
+ override def sql: String = RuntimeReplaceable.this.prettyName +
+ prettyChildren.map(_.sql).mkString("(", sqlStrSeparator, ")")
+
+ protected var prettyChildren: Seq[Expression] = innerChildren
Review comment:
I feel having the pretty functionality in `RuntimeReplaceable` is a bit
intrusive. Dropping the idea above is okay, but I think we need a more general
solution for getting pretty strings outside `RuntimeReplaceable`. WDYT?
@cloud-fan
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