{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/41423533","id":41423533,"diff_hunk":"@@ -116,27 +116,19 @@ class TestHiveContext(sc: SparkContext) extends HiveContext(sc) {\n   override def executePlan(plan: LogicalPlan): this.QueryExecution =\n     new this.QueryExecution(plan)\n \n-  // Make sure we set those test specific confs correctly when we create\n-  // the SQLConf as well as when we call clear.\n-  override protected[sql] def createSession(): SQLSession = {\n-    new this.SQLSession()\n-  }\n-\n-  protected[hive] class SQLSession extends super.SQLSession {\n-    protected[sql] override lazy val conf: SQLConf = new SQLConf {\n-      // TODO as in unit test, conf.clear() probably be called, all of the value will be cleared.\n-      // The super.getConf(SQLConf.DIALECT) is \"sql\" by default, we need to set it as \"hiveql\"\n-      override def dialect: String = super.getConf(SQLConf.DIALECT, \"hiveql\")\n-      override def caseSensitiveAnalysis: Boolean = getConf(SQLConf.CASE_SENSITIVE, false)\n+  protected[sql] override lazy val conf: SQLConf = new SQLConf {\n+    // TODO as in unit test, conf.clear() probably be called, all of the value will be cleared.","path":"sql/hive/src/main/scala/org/apache/spark/sql/hive/test/TestHive.scala","position":17,"original_position":17,"commit_id":"ae0e87677a6c27532f071c4f064d42805029b53d","original_commit_id":"ae0e87677a6c27532f071c4f064d42805029b53d","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":"existing: is this TODO relevant still?","created_at":"2015-10-07T17:59:49Z","updated_at":"2015-10-07T17:59:49Z","html_url":"https://github.com/apache/spark/pull/8909#discussion_r41423533","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/8909","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/41423533"},"html":{"href":"https://github.com/apache/spark/pull/8909#discussion_r41423533"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/8909"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/8909","id":45952094,"html_url":"https://github.com/apache/spark/pull/8909","diff_url":"https://github.com/apache/spark/pull/8909.diff","patch_url":"https://github.com/apache/spark/pull/8909.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/8909","number":8909,"state":"open","locked":false,"title":"[SPARK-10810] [SPARK-10902] [SQL] Improve session management in SQL","user":{"login":"davies","id":40902,"avatar_url":"https://avatars.githubusercontent.com/u/40902?v=3","gravatar_id":"","url":"https://api.github.com/users/davies","html_url":"https://github.com/davies","followers_url":"https://api.github.com/users/davies/followers","following_url":"https://api.github.com/users/davies/following{/other_user}","gists_url":"https://api.github.com/users/davies/gists{/gist_id}","starred_url":"https://api.github.com/users/davies/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davies/subscriptions","organizations_url":"https://api.github.com/users/davies/orgs","repos_url":"https://api.github.com/users/davies/repos","events_url":"https://api.github.com/users/davies/events{/privacy}","received_events_url":"https://api.github.com/users/davies/received_events","type":"User","site_admin":false},"body":"This PR improve the sessions management by replacing the thread-local based to one SQLContext per session approach, introduce separated temporary tables and UDFs/UDAFs for each session.\r\n\r\nA new session of SQLContext could be created by:\r\n\r\n1) create an new SQLContext\r\n2) call newSession() on existing SQLContext\r\n\r\nFor HiveContext, in order to reduce the cost for each session, the classloader and Hive client are shared across multiple sessions (created by newSession).\r\n\r\nCacheManager is also shared by multiple sessions, so cache a table multiple times in different sessions will not cause multiple copies of in-memory cache.\r\n\r\nAdded jars are still shared by all the sessions, because SparkContext does not support sessions.\r\n\r\ncc @marmbrus @yhuai @rxin 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