there is something wrong with AggregateFunction count

[worldmaomao]

Here is the data query every 10s:
sql:
SELECT * FROM events where meta(device)="TestModbusDevice" and (Coil_150 !=null or Coil_100 != null) GROUP BY TUMBLINGWINDOW(ss, 10)

query data:
[{"Coil_150":true},{"Coil_100":true}]
[{"Coil_150":true},{"Coil_100":true}]
[{"Coil_150":true},{"Coil_100":true}]
[{"Coil_150":true},{"Coil_100":true}]
[{"Coil_150":true},{"Coil_100":true}]
[{"Coil_150":true},{"Coil_100":true}]

Now I want to calculate the total count for different element in every 10s.
Here is my sql:

SELECT count(Coil_150) as a, count(Coil_100) as b FROM events where meta(device)="TestModbusDevice" and (Coil_150 !=null or Coil_100 != null) GROUP BY TUMBLINGWINDOW(ss, 10)

the actual result:
[{"a":2,"b":2}]
[{"a":2,"b":2}]
[{"a":2,"b":2}]
[{"a":2,"b":2}]
[{"a":2,"b":2}]

the expect result:
[{"a":1,"b":1}]
[{"a":1,"b":1}]
[{"a":1,"b":1}]
[{"a":1,"b":1}]
[{"a":1,"b":1}]

So it is something wrong with my sql or it is bug ?
my kuiper version is 0.4.1
Thank you！

[worldmaomao]

you are a super man!

[ngjaying]

you are a super man!

Laugh. Thanks for the very clear description, it helps us to identify the problem much faster.