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https://issues.apache.org/jira/browse/IOTDB-181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jialin Qiao closed IOTDB-181.
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Resolution: Later
> 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
> Priority: Minor
>
> 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?
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