{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/53514603","id":53514603,"diff_hunk":"@@ -0,0 +1,68 @@\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.sql.catalyst.InternalRow\n+import org.apache.spark.sql.catalyst.analysis.TypeCheckResult\n+import org.apache.spark.sql.catalyst.expressions.codegen.CodegenFallback\n+import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan\n+import org.apache.spark.sql.types.DataType\n+\n+/**\n+  * A interface for subquery that is used in expressions.\n+  */\n+trait SubqueryExpression extends LeafExpression {\n+  def query: LogicalPlan\n+  def withNewPlan(plan: LogicalPlan): SubqueryExpression","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala","position":31,"original_position":31,"commit_id":"a4bae33c7f42660d13f5f8cf98d34bae0325f6ad","original_commit_id":"a4bae33c7f42660d13f5f8cf98d34bae0325f6ad","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":"scala doc","created_at":"2016-02-19T20:33:45Z","updated_at":"2016-02-19T20:33:45Z","html_url":"https://github.com/apache/spark/pull/11190#discussion_r53514603","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/11190","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/53514603"},"html":{"href":"https://github.com/apache/spark/pull/11190#discussion_r53514603"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/11190"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/11190","id":59242383,"html_url":"https://github.com/apache/spark/pull/11190","diff_url":"https://github.com/apache/spark/pull/11190.diff","patch_url":"https://github.com/apache/spark/pull/11190.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/11190","number":11190,"state":"open","locked":false,"title":"[SPARK-13306] [SQL] uncorrelated scalar subquery","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":"A scalar subquery is a subquery that only generate single row and single column, could be used as part of expression. Uncorrelated scalar subquery means it does not has a reference to external table.\r\n\r\nAll the uncorrelated scalar subqueries will be executed during prepare() of 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