Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r49045865
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -340,6 +369,12 @@ case class FindInSet(left: Expression, right:
Expression) extends BinaryExpressi
}
override def dataType: DataType = IntegerType
+
+ override def prettyName: String = "find_in_set"
+
+ override def sql: Option[String] = for {
--- End diff --
Then maybe simply returns a `String` and throw an exception if the
expression is either not supported yet or inherently doesn't have a SQL
representation (e.g. ScalaUDF)?
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