Return-Path: X-Original-To: archive-asf-public@cust-asf.ponee.io 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 52C73160C15 for ; Wed, 3 Jan 2018 10:01:07 +0100 (CET) Received: (qmail 99087 invoked by uid 500); 3 Jan 2018 09:01:06 -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 99078 invoked by uid 99); 3 Jan 2018 09:01:06 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 03 Jan 2018 09:01:06 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd2-us-west.apache.org (ASF Mail Server at spamd2-us-west.apache.org) with ESMTP id D6B4F1A090C for ; Wed, 3 Jan 2018 09:01:05 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -99.211 X-Spam-Level: X-Spam-Status: No, score=-99.211 tagged_above=-999 required=6.31 tests=[KAM_ASCII_DIVIDERS=0.8, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-us.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id ScErHZ5mXEBu for ; Wed, 3 Jan 2018 09:01:01 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-us.apache.org (ASF Mail Server at mx1-lw-us.apache.org) with ESMTP id 222FE5FB0B for ; Wed, 3 Jan 2018 09:01:01 +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 6F414E023C for ; Wed, 3 Jan 2018 09:01:00 +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 2F537212F7 for ; Wed, 3 Jan 2018 09:01:00 +0000 (UTC) Date: Wed, 3 Jan 2018 09:01:00 +0000 (UTC) From: "Gopal V (JIRA)" To: issues@hive.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HIVE-18079) Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Wed, 03 Jan 2018 09:01:08 -0000 [ https://issues.apache.org/jira/browse/HIVE-18079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Gopal V updated HIVE-18079: --------------------------- Attachment: HIVE-18079.6.patch > Statistics: Allow HyperLogLog to be merged to the lowest-common-denominator bit-size > ------------------------------------------------------------------------------------ > > Key: HIVE-18079 > URL: https://issues.apache.org/jira/browse/HIVE-18079 > Project: Hive > Issue Type: Improvement > Components: Standalone Metastore, Statistics > Affects Versions: 3.0.0 > Reporter: Gopal V > Assignee: Gopal V > Attachments: HIVE-18079.1.patch, HIVE-18079.2.patch, HIVE-18079.4.patch, HIVE-18079.5.patch, HIVE-18079.6.patch > > > HyperLogLog can merge a 14 bit HLL into a 10 bit HLL bitset, because of its mathematical hash distribution & construction. > Allow the squashing of a 14 bit HLL -> 10 bit HLL without needing a second scan over the data-set. -- This message was sent by Atlassian JIRA (v6.4.14#64029)