Hi, +1.
Do not forget to log the changes into format-changelist.md Best, ----------------------------------- Xiangdong Huang School of Software, Tsinghua University 黄向东 清华大学 软件学院 Jialin Qiao (Jira) <j...@apache.org> 于2019年8月27日周二 上午10:07写道： > Jialin Qiao created IOTDB-181: > --------------------------------- > > Summary: Remove "first_value" and "last_value" in TsDigest > Key: IOTDB-181 > URL: https://issues.apache.org/jira/browse/IOTDB-181 > Project: Apache IoTDB > Issue Type: Improvement > Reporter: Jialin Qiao > > > In TsDigest, we have five statistics: min_value, max_value, sum_value, > first_value, last_value. > > When filtering page or chunk, we use min_value and max_value for a filter > like "s1>10" or "s1<20". > > The sum value can be used in aggregation query "select sum(s1) from > root...". > > However, it is difficult for me to come up with a scenario that uses > "first_value" and "last_value" to filter data, and they are never used at > all... > > So why not remove them? > > > > -- > This message was sent by Atlassian Jira > (v8.3.2#803003) >
