Yuan Tian created IOTDB-5000:
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Summary: Implement a new built-in function DIFFERENCE
Key: IOTDB-5000
URL: https://issues.apache.org/jira/browse/IOTDB-5000
Project: Apache IoTDB
Issue Type: New Feature
Reporter: Yuan Tian
Assignee: 李伟豪
Returns the result of subtraction between subsequent column values;
You can refer to influxDB
([https://docs.influxdata.com/influxdb/v2.5/query-data/influxql/functions/transformations/#difference)]
Actually, this function is a substitution for window function lag and lead.
We should decide to how to deal with null value, so before starting, you should
figure out how other dbs deal with that like InfluxDB, TimescaleDB(using lag
and lead windows function to mimic).
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