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)