{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/23818400","id":23818400,"diff_hunk":"@@ -94,12 +89,32 @@ case class Star(\n   override def qualifiers = throw new UnresolvedException(this, \"qualifiers\")\n   override lazy val resolved = false\n \n-  override def newInstance = this\n+  override def newInstance() = this\n   override def withNullability(newNullability: Boolean) = this\n   override def withQualifiers(newQualifiers: Seq[String]) = this\n   override def withName(newName: String) = this\n \n-  def expand(input: Seq[Attribute], resolver: Resolver): Seq[NamedExpression] = {\n+  // Star gets expanded at runtime so we never evaluate a Star.\n+  override def eval(input: Row = null): EvaluatedType =\n+    throw new TreeNodeException(this, s\"No function to evaluate expression. type: ${this.nodeName}\")\n+\n+  def expand(input: Seq[Attribute], resolver: Resolver): Seq[NamedExpression]\n+}\n+\n+\n+/**\n+ * Represents all of the input attributes to a given relational operator, for example in\n+ * \"SELECT * FROM ...\".\n+ *\n+ * @param table an optional table that should be the target of the expansion.  If omitted all\n+ *              tables' columns are produced.\n+ */\n+case class UnresolvedStar(\n+    table: Option[String],\n+    mapFunction: Attribute => Expression = identity[Attribute])","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala","position":56,"original_position":56,"commit_id":"1a3a1d76c96660078d6abb4e6b3293abe04b03ff","original_commit_id":"1a3a1d76c96660078d6abb4e6b3293abe04b03ff","user":{"login":"marmbrus","id":527,"avatar_url":"https://avatars.githubusercontent.com/u/527?v=3","gravatar_id":"","url":"https://api.github.com/users/marmbrus","html_url":"https://github.com/marmbrus","followers_url":"https://api.github.com/users/marmbrus/followers","following_url":"https://api.github.com/users/marmbrus/following{/other_user}","gists_url":"https://api.github.com/users/marmbrus/gists{/gist_id}","starred_url":"https://api.github.com/users/marmbrus/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/marmbrus/subscriptions","organizations_url":"https://api.github.com/users/marmbrus/orgs","repos_url":"https://api.github.com/users/marmbrus/repos","events_url":"https://api.github.com/users/marmbrus/events{/privacy}","received_events_url":"https://api.github.com/users/marmbrus/received_events","type":"User","site_admin":false},"body":"As long as you are cleaning up, I think this was a failed experiment of mine?  If it'll compile without I'd remove it.","created_at":"2015-01-30T01:25:36Z","updated_at":"2015-01-30T01:25:36Z","html_url":"https://github.com/apache/spark/pull/4283#discussion_r23818400","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/4283","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/23818400"},"html":{"href":"https://github.com/apache/spark/pull/4283#discussion_r23818400"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/4283"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/4283","id":28331107,"html_url":"https://github.com/apache/spark/pull/4283","diff_url":"https://github.com/apache/spark/pull/4283.diff","patch_url":"https://github.com/apache/spark/pull/4283.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/4283","number":4283,"state":"open","locked":false,"title":"[SQL] Support df(\"*\") to select all columns in a data 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df(\"*\")).\r\n","created_at":"2015-01-30T01:23:10Z","updated_at":"2015-01-30T01:25:36Z","closed_at":null,"merged_at":null,"merge_commit_sha":"9bbcdcfb83b15530591be0bbc48972b57b092f38","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/4283/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/4283/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments/{number}","comments_url":"https://api.github.com/repos/apache/spark/issues/4283/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/1a3a1d76c96660078d6abb4e6b3293abe04b03ff","head":{"label":"rxin:df-star","ref":"df-star","sha":"1a3a1d76c96660078d6abb4e6b3293abe04b03ff","user":{"login":"rxin","id":323388,"avatar_url":"https://avatars.githubusercontent.com/u/323388?v=3","gravatar_id":"","url":"https://api.github.com/users/rxin","html_url":"https://github.com/rxin","followers_url":"https://api.github.com/users/rxin/followers","following_url":"https://api.github.com/users/rxin/following{/other_user}","gists_url":"https://api.github.com/users/rxin/gists{/gist_id}","starred_url":"https://api.github.com/users/rxin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rxin/subscriptions","organizations_url":"https://api.github.com/users/rxin/orgs","repos_url":"https://api.github.com/users/rxin/repos","events_url":"https://api.github.com/users/rxin/events{/privacy}","received_events_url":"https://api.github.com/users/rxin/received_events","type":"User","site_admin":false},"repo":{"id":17192644,"name":"spark","full_name":"rxin/spark","owner":{"login":"rxin","id":323388,"avatar_url":"https://avatars.githubusercontent.com/u/323388?v=3","gravatar_id":"","url":"https://api.github.com/users/rxin","html_url":"https://github.com/rxin","followers_url":"https://api.github.com/users/rxin/followers","following_url":"https://api.github.com/users/rxin/following{/other_user}","gists_url":"https://api.github.com/users/rxin/gists{/gist_id}","starred_url":"https://api.github.com/users/rxin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rxin/subscriptions","organizations_url":"https://api.github.com/users/rxin/orgs","repos_url":"https://api.github.com/users/rxin/repos","events_url":"https://api.github.com/users/rxin/events{/privacy}","received_events_url":"https://api.github.com/users/rxin/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/rxin/spark","description":"Mirror 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