From issues-return-2298-apmail-kylin-issues-archive=kylin.apache.org@kylin.apache.org Tue Jan 12 03:42:05 2016 Return-Path: X-Original-To: apmail-kylin-issues-archive@minotaur.apache.org Delivered-To: apmail-kylin-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id D237A1872F for ; Tue, 12 Jan 2016 03:42:04 +0000 (UTC) Received: (qmail 97189 invoked by uid 500); 12 Jan 2016 03:36:40 -0000 Delivered-To: apmail-kylin-issues-archive@kylin.apache.org Received: (qmail 97139 invoked by uid 500); 12 Jan 2016 03:36:40 -0000 Mailing-List: contact issues-help@kylin.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: dev@kylin.apache.org Delivered-To: mailing list issues@kylin.apache.org Received: (qmail 97064 invoked by uid 99); 12 Jan 2016 03:36:39 -0000 Received: from arcas.apache.org (HELO arcas) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 12 Jan 2016 03:36:39 +0000 Received: from arcas.apache.org (localhost [127.0.0.1]) by arcas (Postfix) with ESMTP id D1EE72C14F7 for ; Tue, 12 Jan 2016 03:36:39 +0000 (UTC) Date: Tue, 12 Jan 2016 03:36:39 +0000 (UTC) From: "Prashant Prakash (JIRA)" To: issues@kylin.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (KYLIN-1304) Incorrect count estimate upon HyperLogLogPlusCounter.merge operation. 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/KYLIN-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Prashant Prakash updated KYLIN-1304: ------------------------------------ Attachment: registers.txt Attaching HyperLogLogPlusCounter.registers as test input. > Incorrect count estimate upon HyperLogLogPlusCounter.merge operation. > --------------------------------------------------------------------- > > Key: KYLIN-1304 > URL: https://issues.apache.org/jira/browse/KYLIN-1304 > Project: Kylin > Issue Type: Bug > Affects Versions: v1.1.1 > Reporter: Prashant Prakash > Attachments: registers.txt > > > We are using hllc12 for evaluating uniques for a measure in a table partitioned over date. > The uniques estimate for individual dates 2016-01-07, 2016-01-08, 2016-01-09 are 93,728,324, 90,982,364, 45,485,278 respectively. > But the uniques across days, which is calculated through HyperLogLogPlusCounter.merge operation gives a incorrect value 67,980,576. -- This message was sent by Atlassian JIRA (v6.3.4#6332)