apache / apache/iotdb

IoTDB(0.12.5),计算某时间段数据的平均值,昨天计算结果和今天的计算结果不一样

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Description

我在IoTDB(0.12.5)中创建了一个时序序列,dataType:DOUBLE,encoding:PLAIN,compression:SNAPPY
里面存储的数据是每秒一个值,数据小数点后位数较长,类似这种数据,21.11077143919472、13.338655912277863
使用如下类似语句计算小时内的平均值:
select AVG(e) from root.a.b.$c$d where time>=1669042800000 and time<1669046400000 group by([1669042800000,1669046400000), 1h)

昨天和今天都分别执行该语句,两天计算出的结果,有些许的偏差
昨天结算结果是:49.64659657087113
今天的计算结果是:49.64659657087112

请问这是怎么回事

Contributor guide

Open the contributing guide

Research direction

No source file or test is named; begin by reproducing the AVG/group-by query in IoTDB 0.12.5 with the reported DOUBLE values and compare repeated executions. Done means determining the cause of the 1e-14 result difference and documenting or correcting the behavior.

Written by the indexing model from the issue text.

Assessment

Domain
databases
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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