Jialin Qiao created IOTDB-181:
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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?
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