{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/69503280","id":69503280,"diff_hunk":"@@ -94,6 +94,70 @@ case class UserDefinedGenerator(\n }\n \n /**\n+ * Separate v1, ..., vk into n rows. Each row will have k/n columns. n must be constant.\n+ * {{{\n+ *   SELECT stack(2, 1, 2, 3)) ->\n+ *   1      2\n+ *   3      NULL\n+ * }}}\n+ */\n+@ExpressionDescription(\n+  usage = \"_FUNC_(n, v1, ..., vk) - Separate v1, ..., vk into n rows.\",\n+  extended = \"> SELECT _FUNC_(2, 1, 2, 3);\\n  [1,2]\\n  [3,null]\")\n+case class Stack(children: Seq[Expression])\n+    extends Expression with Generator with CodegenFallback {\n+\n+  private lazy val numRows = try {\n+    children.head.eval().asInstanceOf[Int]\n+  } catch {\n+    case _: ClassCastException =>\n+      throw new AnalysisException(\"The number of rows must be a positive constant integer.\")\n+  }\n+\n+  private lazy val numFields = ((children.length - 1) + numRows - 1) / numRows\n+\n+  override def checkInputDataTypes(): TypeCheckResult = {\n+    if (children.length <= 1) {\n+      TypeCheckResult.TypeCheckFailure(s\"$prettyName requires at least 2 arguments.\")\n+    } else if (children.head.dataType != IntegerType || !children.head.foldable ||\n+      children.head.eval().asInstanceOf[Int] < 1) {\n+      TypeCheckResult.TypeCheckFailure(\"The number of rows must be a positive constant integer.\")\n+    } else {\n+      for (i <- 1 until children.length) {\n+        val j = (i - 1) % numFields\n+        if (children(i).dataType != elementSchema.fields(j).dataType) {\n+          return TypeCheckResult.TypeCheckFailure(\n+            s\"Argument ${j + 1} (${elementSchema.fields(j).dataType}) != \" +","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala","position":39,"original_position":46,"commit_id":"9d93ddc1c79819b7b65301575dc54d02c4fae577","original_commit_id":"51738d70dfa59329254996db6770e428f729e127","user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"body":"I see. Thank you for this.","created_at":"2016-07-05T03:22:47Z","updated_at":"2016-07-05T03:22:47Z","html_url":"https://github.com/apache/spark/pull/14033#discussion_r69503280","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/14033","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/69503280"},"html":{"href":"https://github.com/apache/spark/pull/14033#discussion_r69503280"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/14033"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/14033","id":76081255,"html_url":"https://github.com/apache/spark/pull/14033","diff_url":"https://github.com/apache/spark/pull/14033.diff","patch_url":"https://github.com/apache/spark/pull/14033.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/14033","number":14033,"state":"open","locked":false,"title":"[SPARK-16286][SQL] Implement stack table generating function","user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nThis PR implements `stack` table generating function.\r\n\r\n## How was this patch tested?\r\n\r\nPass the Jenkins tests including new testcases.","created_at":"2016-07-03T05:20:44Z","updated_at":"2016-07-05T03:22:47Z","closed_at":null,"merged_at":null,"merge_commit_sha":"42fa2d03045123e1a33d4486e0bb34a575e65d3c","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/14033/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/14033/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/14033/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/9d93ddc1c79819b7b65301575dc54d02c4fae577","head":{"label":"dongjoon-hyun:SPARK-16286","ref":"SPARK-16286","sha":"9d93ddc1c79819b7b65301575dc54d02c4fae577","user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"repo":{"id":28900400,"name":"spark","full_name":"dongjoon-hyun/spark","owner":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/dongjoon-hyun/spark","description":"Mirror 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