Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r49039342
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -356,6 +359,8 @@ abstract class UnaryExpression extends Expression {
"""
}
}
+
+ override def sql: Option[String] = child.sql.map(childSQL =>
s"($prettyName($childSQL))")
--- End diff --
Maybe it is good to add doc in the code to mention that `prettyName` should
match the name registered in function registry.
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