From issues-return-103774-archive-asf-public=cust-asf.ponee.io@hive.apache.org Fri Feb 2 02:59:03 2018 Return-Path: X-Original-To: archive-asf-public@eu.ponee.io Delivered-To: archive-asf-public@eu.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by mx-eu-01.ponee.io (Postfix) with ESMTP id BDD28180652 for ; Fri, 2 Feb 2018 02:59:03 +0100 (CET) Received: by cust-asf.ponee.io (Postfix) id ADD9E160C56; Fri, 2 Feb 2018 01:59:03 +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 02DDD160C44 for ; Fri, 2 Feb 2018 02:59:02 +0100 (CET) Received: (qmail 96991 invoked by uid 500); 2 Feb 2018 01:59:02 -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 96982 invoked by uid 99); 2 Feb 2018 01:59:02 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd1-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 02 Feb 2018 01:59:02 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd1-us-west.apache.org (ASF Mail Server at spamd1-us-west.apache.org) with ESMTP id A575F177093 for ; Fri, 2 Feb 2018 01:59:01 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd1-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -109.511 X-Spam-Level: X-Spam-Status: No, score=-109.511 tagged_above=-999 required=6.31 tests=[ENV_AND_HDR_SPF_MATCH=-0.5, KAM_ASCII_DIVIDERS=0.8, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01, USER_IN_DEF_SPF_WL=-7.5, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-us.apache.org ([10.40.0.8]) by localhost (spamd1-us-west.apache.org [10.40.0.7]) (amavisd-new, port 10024) with ESMTP id xEVUmVZGiDp5 for ; Fri, 2 Feb 2018 01:59:01 +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 F3ABE5F296 for ; Fri, 2 Feb 2018 01:59:00 +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 83F69E0144 for ; Fri, 2 Feb 2018 01:59:00 +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 417E421E80 for ; Fri, 2 Feb 2018 01:59:00 +0000 (UTC) Date: Fri, 2 Feb 2018 01:59:00 +0000 (UTC) From: "Mithun Radhakrishnan (JIRA)" To: issues@hive.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HIVE-18608) ORC should allow selectively disabling dictionary-encoding on specified columns 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-18608?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Mithun Radhakrishnan updated HIVE-18608: ---------------------------------------- Attachment: (was: HIVE-18608.1-branch-2.2.patch) > ORC should allow selectively disabling dictionary-encoding on specified columns > ------------------------------------------------------------------------------- > > Key: HIVE-18608 > URL: https://issues.apache.org/jira/browse/HIVE-18608 > Project: Hive > Issue Type: New Feature > Components: ORC > Affects Versions: 3.0.0, 2.4.0, 2.2.1 > Reporter: Mithun Radhakrishnan > Assignee: Mithun Radhakrishnan > Priority: Major > Attachments: HIVE-18608.1-branch-2.2.patch > > > Just as ORC allows the choice of columns to enable bloom-filters on, it would be nice to have a way to specify which columns {{DICTIONARY_V2}} encoding should be disabled on. > Currently, the choice of dictionary-encoding depends on the results of sampling the first row-stride within a stripe. If the user knows that a column's cardinality is bound to prevent an effective dictionary, she might choose to simply disable it on just that column, and avoid the cost of sampling in the first row-stride. -- This message was sent by Atlassian JIRA (v7.6.3#76005)