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 BA092E540 for ; Tue, 26 Feb 2013 03:46:15 +0000 (UTC) Received: (qmail 72550 invoked by uid 500); 26 Feb 2013 03:46:15 -0000 Delivered-To: apmail-hive-dev-archive@hive.apache.org Received: (qmail 72476 invoked by uid 500); 26 Feb 2013 03:46:14 -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 72438 invoked by uid 500); 26 Feb 2013 03:46:13 -0000 Delivered-To: apmail-hadoop-hive-dev@hadoop.apache.org Received: (qmail 72435 invoked by uid 99); 26 Feb 2013 03:46:13 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 26 Feb 2013 03:46:13 +0000 Date: Tue, 26 Feb 2013 03:46:13 +0000 (UTC) From: "Lianhui Wang (JIRA)" To: hive-dev@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HIVE-4014) Hive+RCFile is not doing column pruning and reading much more data than necessary MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HIVE-4014?page=3Dcom.atlassian.= jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D13586= 701#comment-13586701 ]=20 Lianhui Wang commented on HIVE-4014: ------------------------------------ i donot think that. i see the code. in HiveInputFormat and CombineHiveInputFormat's getRecordReader()=EF=BC=8C = it calls pushProjectionsAndFilters(). also in pushProjectionsAndFilters(), from TableScanOperator it get needed c= olumns and set these ids to hive.io.file.readcolumn.ids. and then in RCFile.Reader will read hive.io.file.readcolumn.ids to skip col= umn. maybe the counter has some mistakes. if i have mistake,please tell me.thx. =20 > Hive+RCFile is not doing column pruning and reading much more data than n= ecessary > -------------------------------------------------------------------------= -------- > > Key: HIVE-4014 > URL: https://issues.apache.org/jira/browse/HIVE-4014 > Project: Hive > Issue Type: Bug > Reporter: Vinod Kumar Vavilapalli > Assignee: Vinod Kumar Vavilapalli > > With even simple projection queries, I see that HDFS bytes read counter d= oesn't show any reduction in the amount of data read. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrato= rs For more information on JIRA, see: http://www.atlassian.com/software/jira