ayudovin opened a new pull request, #37923:
URL: https://github.com/apache/spark/pull/37923
### What changes were proposed in this pull request?
Implement `GroupBy.prod`
### Why are the changes needed?
for API coverage
### Does this PR introduce _any_ user-facing change?
yes, the new API
```
df = ps.DataFrame({'A': [1, 1, 2, 1, 2],
'B': [np.nan, 2, 3, 4, 5],
'C': [1, 2, 1, 1, 2],
'D': [True, False, True, False, True]})
Groupby one column and return the prod of the remaining columns in
each group.
df.groupby('A').prod()
B C D
A
1 8.0 2 0
2 15.0 2 11
df.groupby('A').prod(min_count=3)
B C D
A
1 NaN 2 0
2 NaN NaN NaN
```
### How was this patch tested?
added UT
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