{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/70172672","id":70172672,"diff_hunk":"@@ -442,6 +442,10 @@ class SessionCatalog(\n     name.database.isEmpty && tempTables.contains(formatTableName(name.table))\n   }\n \n+  def listTemporaryTableOutput(name: String): Seq[Attribute] = {","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/SessionCatalog.scala","position":13,"original_position":13,"commit_id":"46196a44d18426a107b480b8157c5accedecbbd1","original_commit_id":"46196a44d18426a107b480b8157c5accedecbbd1","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":"Ah. I remember that why I do this in this way. Basically, there are two barriers to reach `getTableMetadata`. Before making change, let me describe here.\r\n\r\n1. Redirecting: `listColumns(table)`  -> `listColumns(currentDatabase, tableName)`\r\n2. Table existence failure: `requireTableExists(dbName, tableName)` in `listColumns(currentDatabase, tableName)`.\r\n\r\nAnyway, I'm trying to change the above barriers.","created_at":"2016-07-09T22:12:19Z","updated_at":"2016-07-09T22:12:19Z","html_url":"https://github.com/apache/spark/pull/14114#discussion_r70172672","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/14114","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/70172672"},"html":{"href":"https://github.com/apache/spark/pull/14114#discussion_r70172672"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/14114"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/14114","id":76843504,"html_url":"https://github.com/apache/spark/pull/14114","diff_url":"https://github.com/apache/spark/pull/14114.diff","patch_url":"https://github.com/apache/spark/pull/14114.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/14114","number":14114,"state":"open","locked":false,"title":"[SPARK-16458][SQL] SessionCatalog should support `listColumns` for temporary tables","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\nTemporary tables are used frequently, but `spark.catalog.listColumns` does not support those tables. This PR make `SessionCatalog` supports temporary table column listing.\r\n\r\n**Before**\r\n```scala\r\nscala> spark.range(10).createOrReplaceTempView(\"t1\")\r\n\r\nscala> spark.catalog.listTables().collect()\r\nres1: Array[org.apache.spark.sql.catalog.Table] = Array(Table[name=`t1`, tableType=`TEMPORARY`, isTemporary=`true`])\r\n\r\nscala> spark.catalog.listColumns(\"t1\").collect()\r\norg.apache.spark.sql.AnalysisException: Table `t1` does not exist in database `default`.;\r\n```\r\n\r\n**After**\r\n```\r\nscala> spark.catalog.listColumns(\"t1\").collect()\r\nres2: Array[org.apache.spark.sql.catalog.Column] = Array(Column[name='id', description='id', dataType='bigint', nullable='false', isPartition='false', isBucket='false'])\r\n```\r\n## How was this patch tested?\r\n\r\nPass the Jenkins tests including a new testcase.","created_at":"2016-07-09T10:01:14Z","updated_at":"2016-07-09T22:12:19Z","closed_at":null,"merged_at":null,"merge_commit_sha":"7306a79bf77664011523a240f896014da8cc7c2e","assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/14114/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/14114/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/14114/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/46196a44d18426a107b480b8157c5accedecbbd1","head":{"label":"dongjoon-hyun:SPARK-16458","ref":"SPARK-16458","sha":"46196a44d18426a107b480b8157c5accedecbbd1","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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