{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/137929831","pull_request_review_id":61665985,"id":137929831,"diff_hunk":"@@ -0,0 +1,47 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License.  You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.spark.sql.catalyst.expressions\n+\n+import org.apache.spark.SparkContext\n+import org.apache.spark.sql.catalyst.InternalRow\n+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback\n+import org.apache.spark.sql.types.{DataType, StringType}\n+\n+/**\n+ * Return the user executing the current query.\n+ *\n+ * There is no code generation since this expression should get constant folded by the optimizer.\n+ */\n+@ExpressionDescription(\n+  usage = \"\"\"\n+    _FUNC_() - Returns the current user executing the query.\n+  \"\"\",\n+  since = \"2.3.0\")\n+case class CurrentUser() extends LeafExpression with CodegenFallback {\n+  override def foldable: Boolean = true\n+  override def nullable: Boolean = false\n+  override def dataType: DataType = StringType\n+\n+  /** Returns the result of evaluating this expression on a given input Row */\n+  override def eval(input: InternalRow): Any = {\n+    SparkContext.getActive.map(_.sparkUser).getOrElse(\"\")","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/CurrentUser.scala","position":42,"original_position":42,"commit_id":"6b0b6bd9299c637be30407570d410f2134d8a48f","original_commit_id":"6b0b6bd9299c637be30407570d410f2134d8a48f","user":{"login":"gatorsmile","id":11567269,"avatar_url":"https://avatars1.githubusercontent.com/u/11567269?v=4","gravatar_id":"","url":"https://api.github.com/users/gatorsmile","html_url":"https://github.com/gatorsmile","followers_url":"https://api.github.com/users/gatorsmile/followers","following_url":"https://api.github.com/users/gatorsmile/following{/other_user}","gists_url":"https://api.github.com/users/gatorsmile/gists{/gist_id}","starred_url":"https://api.github.com/users/gatorsmile/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gatorsmile/subscriptions","organizations_url":"https://api.github.com/users/gatorsmile/orgs","repos_url":"https://api.github.com/users/gatorsmile/repos","events_url":"https://api.github.com/users/gatorsmile/events{/privacy}","received_events_url":"https://api.github.com/users/gatorsmile/received_events","type":"User","site_admin":false},"body":"Sorry, I do not think we should support it until we provide session-specific user management.","created_at":"2017-09-09T16:22:35Z","updated_at":"2017-09-09T16:22:35Z","html_url":"https://github.com/apache/spark/pull/19169#discussion_r137929831","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/19169","author_association":"MEMBER","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/137929831"},"html":{"href":"https://github.com/apache/spark/pull/19169#discussion_r137929831"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/19169"}},"in_reply_to_id":137920242},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/19169","id":140057214,"html_url":"https://github.com/apache/spark/pull/19169","diff_url":"https://github.com/apache/spark/pull/19169.diff","patch_url":"https://github.com/apache/spark/pull/19169.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/19169","number":19169,"state":"open","locked":false,"title":"[SPARK-21957][SQL] Add current_user function","user":{"login":"mgaido91","id":8821783,"avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"body":"## What changes were proposed in this pull request?\r\n\r\nAdded the `current_user` function.\r\n\r\n## How was this patch tested?\r\n\r\nAdded UTs.\r\n","created_at":"2017-09-08T14:55:57Z","updated_at":"2017-09-09T16:22:35Z","closed_at":null,"merged_at":null,"merge_commit_sha":"45e743946d70f904ff8feb94b309cac30e00a6d9","assignee":null,"assignees":[],"requested_reviewers":[],"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/19169/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/19169/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/19169/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/6b0b6bd9299c637be30407570d410f2134d8a48f","head":{"label":"mgaido91:SPARK-21957","ref":"SPARK-21957","sha":"6b0b6bd9299c637be30407570d410f2134d8a48f","user":{"login":"mgaido91","id":8821783,"avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"repo":{"id":94518128,"name":"spark","full_name":"mgaido91/spark","owner":{"login":"mgaido91","id":8821783,"avatar_url":"https://avatars1.githubusercontent.com/u/8821783?v=4","gravatar_id":"","url":"https://api.github.com/users/mgaido91","html_url":"https://github.com/mgaido91","followers_url":"https://api.github.com/users/mgaido91/followers","following_url":"https://api.github.com/users/mgaido91/following{/other_user}","gists_url":"https://api.github.com/users/mgaido91/gists{/gist_id}","starred_url":"https://api.github.com/users/mgaido91/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mgaido91/subscriptions","organizations_url":"https://api.github.com/users/mgaido91/orgs","repos_url":"https://api.github.com/users/mgaido91/repos","events_url":"https://api.github.com/users/mgaido91/events{/privacy}","received_events_url":"https://api.github.com/users/mgaido91/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/mgaido91/spark","description":"Mirror 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