Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 8A4827496 for ; Fri, 5 Aug 2011 23:59:53 +0000 (UTC) Received: (qmail 12956 invoked by uid 500); 5 Aug 2011 23:59:51 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 12900 invoked by uid 500); 5 Aug 2011 23:59:50 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 12892 invoked by uid 99); 5 Aug 2011 23:59:50 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 05 Aug 2011 23:59:50 +0000 X-ASF-Spam-Status: No, hits=-0.0 required=5.0 tests=RCVD_IN_DNSWL_NONE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of yyang@me.com designates 17.148.16.100 as permitted sender) Received: from [17.148.16.100] (HELO asmtpout025.mac.com) (17.148.16.100) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 05 Aug 2011 23:59:42 +0000 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII Received: from [10.10.10.115] (unknown [209.119.60.1]) by asmtp025.mac.com (Oracle Communications Messaging Exchange Server 7u4-20.01 64bit (built Nov 21 2010)) with ESMTPSA id <0LPH008VUBY0JR50@asmtp025.mac.com> for user@cassandra.apache.org; Fri, 05 Aug 2011 16:58:48 -0700 (PDT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.4.6813,1.0.211,0.0.0000 definitions=2011-08-05_06:2011-08-05,2011-08-05,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=1 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1012030000 definitions=main-1108050197 From: Yi Yang Subject: column metadata and sstable Date: Fri, 05 Aug 2011 16:58:47 -0700 Message-id: <207FAD64-A1AD-4E5A-A5EF-778142CB6633@me.com> To: user@cassandra.apache.org X-Mailer: Apple Mail (2.1242) Dear all, I'm wondering what's the advantage of assigning column metadata when NOT using secondary indices. I've gone through the SSTable internal and found out it won't do such conversion. Thus I think the only advantage we got via column metadata is a data validation type, am I correct? Thanks. Steve