Integral function does not work as expected

[hhaim]

> precision rfc3339
> select value from "switch.b0" where time > now() - 2d
name: switch.b0
time                           value
----                           -----
2019-05-07T14:35:42.53137408Z  0
2019-05-07T14:37:37.760206848Z 0
2019-05-07T14:38:17.240751104Z 0
2019-05-07T14:39:57.58061184Z  0
2019-05-07T14:43:48.437899008Z 0
2019-05-07T14:44:28.117872896Z 0
2019-05-07T15:04:28.287107072Z 0
2019-05-07T15:06:55.139759104Z 0
2019-05-07T15:09:42.865874176Z 0
2019-05-08T15:05:04.114242048Z 1
2019-05-08T16:04:04.167064832Z 0
2019-05-08T16:21:04.190484992Z 1
2019-05-08T17:34:04.115187968Z 0
2019-05-09T09:02:43.806310912Z 0
2019-05-09T09:53:06.466994944Z 0

> select integral("value",1h) from "switch.b0" where  (time > now() - 2d)

time                 integral
----         
1970-01-01T00:00:00Z 13.202951293582222
>
>

While the expected value is ~2 hours

2019-05-08T15:05:04.114242048Z 1
2019-05-08T16:04:04.167064832Z 0

2019-05-08T16:21:04.190484992Z 1
2019-05-08T17:34:04.115187968Z 0

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