tree 32c4539d0fd777e28dc3b0a74952f95949c3eace
parent 87d351153bc4aab46f61221aab67bc98b8a40e1e
author Lei YU <yulei.sh@bytedance.com> 1686225725 +0000
committer Lei YU <yulei.sh@bytedance.com> 1696672341 +0800

exprkt: Add ifNan to ignore the NaN value

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

Adding a new exprkt function `ifNan` to handle this case, that if a
value is `nan`, then use the other value.

Example usage in json config:
```
"Expression": "ifNan(maxIgnoreNaN(T0, T1), T2)"
```

The above expression get max value of T0, T1 ignoring nan, and if it's
still nana, it uses the value T2.

Signed-off-by: Lei YU <yulei.sh@bytedance.com>
Change-Id: Ib323f6e18ef9f3317437753018857ad53732f54b