Jialin Qiao created IOTDB-1391:
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Summary: Add a new Aggregation function ext
Key: IOTDB-1391
URL: https://issues.apache.org/jira/browse/IOTDB-1391
Project: Apache IoTDB
Issue Type: New Feature
Reporter: Jialin Qiao
Add a new aggregation function: ext
Return the value that has the maximum absolute value.
If the maximum absolute value of a positive value and a negative value is
equal, return the positive value.
For example:
time：1，2，3，4，5
value：1，10，-4，3，4
select ext(s1) from root.sg.d where time >=1 and time <=5
return 10
select ext(s1) from root.sg.d where time >=3 and time <=4
return -4
select ext(s1) from root.sg.d where time >=3 and time <=5
return 4
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