tree 1716f59df96dd47c50535ee19d5f297fe25230c6
parent 0ab9d8388afe4a01c8b2ecea7bea042d2b4646dd
author Lei YU <yulei.sh@bytedance.com> 1666590865 +0000
committer Lei YU <yulei.sh@bytedance.com> 1696669629 +0800

exprkt: Add sumIgnoreNaN to ignore the NaN value

Arithmetic with `nan` values is not expected in virtual sensor's case.

Adding a new exprkt function `sumIgnoreNaN` to handle this case,
that it ignores all `nan` values. If all values are `nan` then it
returns `nan`, otherwise it returns the sum of the valid values.

Example usage in json config:
```
"Expression": "sumIgnoreNaN(T0, T1, T2, T3)"
```

Signed-off-by: Lei YU <yulei.sh@bytedance.com>
Change-Id: I0cbd87f038499b4ea3ab722c003adc795a11c2b3