zhengruifeng opened a new pull request, #36486:
URL: https://github.com/apache/spark/pull/36486
### What changes were proposed in this pull request?
impl GroupBy.ewm
### Why are the changes needed?
to increase the API coverage
### Does this PR introduce _any_ user-facing change?
yes, new methods added
```
In [10]: psdf
Out[10]:
s1 s2 s3 s4 s5 s6
0 NaN 1.0 1 1 NaN None
1 2.0 NaN 3 0 NaN None
2 3.0 3.0 4 3 1.0 None
3 4.0 4.0 5 4 NaN None
In [11]: psdf.groupby(psdf.s1 + 1).ewm(com=0.2, ignore_na=True).mean()
Out[11]:
s2 s3 s4 s5 s6
s1
3.0 1 NaN 3.0 0.0 NaN NaN
4.0 2 3.0 4.0 3.0 1.0 NaN
5.0 3 4.0 5.0 4.0 NaN NaN
```
### How was this patch tested?
added UT
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