Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id A01C1200C43 for ; Sun, 26 Mar 2017 10:04:46 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 9E982160B87; Sun, 26 Mar 2017 08:04:46 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id E49D8160B6B for ; Sun, 26 Mar 2017 10:04:45 +0200 (CEST) Received: (qmail 83363 invoked by uid 500); 26 Mar 2017 08:04:45 -0000 Mailing-List: contact issues-help@hive.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@hive.apache.org Delivered-To: mailing list issues@hive.apache.org Received: (qmail 83353 invoked by uid 99); 26 Mar 2017 08:04:45 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd4-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 26 Mar 2017 08:04:45 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd4-us-west.apache.org (ASF Mail Server at spamd4-us-west.apache.org) with ESMTP id C376BC096B for ; Sun, 26 Mar 2017 08:04:44 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd4-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -99.202 X-Spam-Level: X-Spam-Status: No, score=-99.202 tagged_above=-999 required=6.31 tests=[KAM_ASCII_DIVIDERS=0.8, RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd4-us-west.apache.org [10.40.0.11]) (amavisd-new, port 10024) with ESMTP id fkpw0tRaQy2f for ; Sun, 26 Mar 2017 08:04:44 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTP id 805C55FBA1 for ; Sun, 26 Mar 2017 08:04:43 +0000 (UTC) Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 2A9E4E0596 for ; Sun, 26 Mar 2017 08:04:42 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id 8974F24063 for ; Sun, 26 Mar 2017 08:04:41 +0000 (UTC) Date: Sun, 26 Mar 2017 08:04:41 +0000 (UTC) From: "Lefty Leverenz (JIRA)" To: issues@hive.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HIVE-16298) Add config to specify multi-column joins have correlated columns MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Sun, 26 Mar 2017 08:04:46 -0000 [ https://issues.apache.org/jira/browse/HIVE-16298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Lefty Leverenz updated HIVE-16298: ---------------------------------- Labels: TODOC3.0 (was: ) > Add config to specify multi-column joins have correlated columns > ---------------------------------------------------------------- > > Key: HIVE-16298 > URL: https://issues.apache.org/jira/browse/HIVE-16298 > Project: Hive > Issue Type: Bug > Reporter: Jason Dere > Assignee: Siddharth Seth > Labels: TODOC3.0 > Fix For: 2.2.0 > > Attachments: HIVE-16298.1.patch, HIVE-16298.2.patch > > > The default row estimation for multi-key joins divides the row estimate by the product of the NDVs for each join column, which can cause the row estimate to be low. Try adding a config to assume the columns are correlated, where we only divide the row estimate by the largest NDV. -- This message was sent by Atlassian JIRA (v6.3.15#6346)