Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9981#discussion_r46658297
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -111,8 +110,11 @@ class Column(protected[sql] val expr: Expression)
extends Logging {
// Leave an unaliased generator with an empty list of names since the
analyzer will generate
// the correct defaults after the nested expression's type has been
resolved.
case explode: Explode => MultiAlias(explode, Nil)
+
case jt: JsonTuple => MultiAlias(jt, Nil)
+ case func: UnresolvedFunction => UnresolvedAlias(func)
--- End diff --
I missed one thing, this will change the alias of functions which are not
generators. Maybe we should add an optionName in `UnresolvedAlias` as the
default aliasing name instead of `c0`, `c1`, etc.
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