Return-Path: X-Original-To: apmail-hive-dev-archive@www.apache.org Delivered-To: apmail-hive-dev-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 0BA6311F88 for ; Wed, 6 Aug 2014 01:54:14 +0000 (UTC) Received: (qmail 32719 invoked by uid 500); 6 Aug 2014 01:54:12 -0000 Delivered-To: apmail-hive-dev-archive@hive.apache.org Received: (qmail 32505 invoked by uid 500); 6 Aug 2014 01:54:12 -0000 Mailing-List: contact dev-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 dev@hive.apache.org Received: (qmail 32226 invoked by uid 500); 6 Aug 2014 01:54:12 -0000 Delivered-To: apmail-hadoop-hive-dev@hadoop.apache.org Received: (qmail 32223 invoked by uid 99); 6 Aug 2014 01:54:12 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 06 Aug 2014 01:54:12 +0000 Date: Wed, 6 Aug 2014 01:54:12 +0000 (UTC) From: "Sergey Shelukhin (JIRA)" To: hive-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HIVE-7616) pre-size mapjoin hashtable based on statistics MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HIVE-7616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14087106#comment-14087106 ] Sergey Shelukhin commented on HIVE-7616: ---------------------------------------- also, for joins where many rows come from right side per key, this patch will not be so good (hashtable will be too big), given the above about number of keys vs number of rows > pre-size mapjoin hashtable based on statistics > ---------------------------------------------- > > Key: HIVE-7616 > URL: https://issues.apache.org/jira/browse/HIVE-7616 > Project: Hive > Issue Type: Improvement > Reporter: Sergey Shelukhin > Assignee: Sergey Shelukhin > Attachments: HIVE-7616.patch > > -- This message was sent by Atlassian JIRA (v6.2#6252)