{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/55104717","id":55104717,"diff_hunk":"@@ -661,6 +664,36 @@ https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation%2C+Cube%2C\n   val INTEGRAL = \"[+-]?\\\\d+\".r\n   val DECIMAL = \"[+-]?((\\\\d+(\\\\.\\\\d*)?)|(\\\\.\\\\d+))\".r\n \n+  /**\n+   * Flattens the left deep tree with the specified pattern into a list.\n+   */\n+  private def flattenLeftDeepTree(node: ASTNode, pattern: Regex): Seq[ASTNode] = {\n+    val collected = ArrayBuffer[ASTNode]()\n+    var rest = node\n+    while (rest match {\n+      case Token(pattern(), l :: r :: Nil) =>\n+        collected += r\n+        rest = l\n+        true\n+      case _ => false\n+    }) {}\n+    collected += rest\n+    collected.reverse","path":"sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/CatalystQl.scala","position":28,"original_position":28,"commit_id":"653cb8243b0c8ff50972869fa0b5db873e3c8857","original_commit_id":"653cb8243b0c8ff50972869fa0b5db873e3c8857","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":"We want to keep the same order as SQL string,\r\n\r\n`A OR B OR C` will become  (OR (OR A B) C), collected will be (C, B, A), we should return (A, B, C)","created_at":"2016-03-04T23:31:08Z","updated_at":"2016-03-04T23:31:08Z","html_url":"https://github.com/apache/spark/pull/11501#discussion_r55104717","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/11501","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/55104717"},"html":{"href":"https://github.com/apache/spark/pull/11501#discussion_r55104717"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/11501"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/11501","id":61644744,"html_url":"https://github.com/apache/spark/pull/11501","diff_url":"https://github.com/apache/spark/pull/11501.diff","patch_url":"https://github.com/apache/spark/pull/11501.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/11501","number":11501,"state":"open","locked":false,"title":"[SPARK-13657] [SQL] parser very long AND/OR expressions","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":"## What changes were proposed in this pull request?\r\n\r\nIn order to avoid StackOverflow when parse a expression with hundreds of ORs, we should use loop instead of recursive functions to flatten the tree as list. This PR also build a balanced tree to reduce the depth of generated And/Or expression, to avoid StackOverflow in analyzer/optimizer.\r\n\r\n\r\n## How was this patch tested?\r\n\r\nAdd new unit tests. Manually tested with TPCDS Q3 with hundreds predicates in it [1]. These helps to reduce the number of partitions, then go query time went from 60 seconds to 8 seconds.\r\n\r\n[1] https://github.com/cloudera/impala-tpcds-kit/blob/master/queries/q3.sql\r\n","created_at":"2016-03-03T23:39:15Z","updated_at":"2016-03-04T23:31:08Z","closed_at":null,"merged_at":null,"merge_commit_sha":"1740340d86e21f947f81e988e0087cb498bf9911","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/11501/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/11501/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/11501/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/653cb8243b0c8ff50972869fa0b5db873e3c8857","head":{"label":"davies:long_or","ref":"long_or","sha":"653cb8243b0c8ff50972869fa0b5db873e3c8857","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},"repo":{"id":21724875,"name":"spark","full_name":"davies/spark","owner":{"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},"private":false,"html_url":"https://github.com/davies/spark","description":"Mirror 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