Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/9562#discussion_r44372724 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala --- @@ -749,10 +749,14 @@ class DataFrame private[sql]( // will remove intermediate Alias for ExtractValue chain, and we need to alias it again to // make it a NamedExpression. case Column(u: UnresolvedAttribute) => UnresolvedAlias(u) + case Column(expr: NamedExpression) => expr - // Leave an unaliased explode with an empty list of names since the analyzer will generate the - // correct defaults after the nested expression's type has been resolved. + + // 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 Column(explode: Explode) => MultiAlias(explode, Nil) + case Column(jt: JsonTuple) => MultiAlias(jt, Nil) --- End diff -- JIRA created: https://issues.apache.org/jira/browse/SPARK-11619
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