dchvn opened a new pull request #34213:
URL: https://github.com/apache/spark/pull/34213
### What changes were proposed in this pull request?
Implement DataFrame.cov
### Why are the changes needed?
Increase pandas API coverage in PySpark
### Does this PR introduce _any_ user-facing change?
User can use
``` python
>>> psdf = ps.DataFrame([(1, 2), (0, 3), (2, 0), (1, 1)],
... columns=['dogs', 'cats'])
>>> psdf.cov()
dogs cats
dogs 0.666667 -1.000000
cats -1.000000 1.666667
>>> pdf = pd.DataFrame(
... {
... "a": [1, np.nan, 3, 4],
... "b": [True, False, False, True],
... "c": [True, True, False, True],
... }
... )
>>> psdf = ps.from_pandas(pdf)
>>> psdf.cov()
a b c
a 2.333333 -0.166667 -0.166667
b -0.166667 0.333333 0.166667
c -0.166667 0.166667 0.250000
```
### How was this patch tested?
unit tests
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