Take a look at this interesting read: https://sysdig.com/blog/column-selection-effects-query-performance/
Ali Hubail Senior Software Developer Petrolink International Ltd. | Milwaukee, WI Office: +966 13 877 1068 | Cell: +1(414)3267981 Email: ali.hub...@petrolink.com | www.petrolink.com Confidentiality warning: This message and any attachments are intended only for the persons to whom this message is addressed, are confidential, and may be privileged. If you are not the intended recipient, you are hereby notified that any review, retransmission, conversion to hard copy, copying, modification, circulation or other use of this message and any attachments is strictly prohibited. If you receive this message in error, please notify the sender immediately by return email, and delete this message and any attachments from your system. Petrolink International Limited its subsidiaries, holding companies and affiliates disclaims all responsibility from and accepts no liability whatsoever for the consequences of any unauthorized person acting, or refraining from acting, on any information contained in this message. For security purposes, staff training, to assist in resolving complaints and to improve our customer service, email communications may be monitored and telephone calls may be recorded. Jean Carlo <jean.jeancar...@gmail.com> 03/20/2018 05:42 AM Please respond to user@cassandra.apache.org To user@cassandra.apache.org, cc Subject select fields and heap usage Hello, Talking about heap pressure, is there any difference between make a ' select *' and a 'select field '? Is cassandra taking into the heap the whole partition to make the merge doesn't matters if we make a select of few rows ? Best greatings Jean Carlo "The best way to predict the future is to invent it" Alan Kay
