xinrong-databricks opened a new pull request #35782:
URL: https://github.com/apache/spark/pull/35782
### What changes were proposed in this pull request?
Add `Series.duplicated` to indicate duplicate Series values.
### Why are the changes needed?
To reach parity with pandas API.
### Does this PR introduce _any_ user-facing change?
Yes, `Series.duplicated` is supported now.
```py
>>> animals = ps.Series(['lama', 'cow', 'lama', 'beetle', 'lama'])
>>> animals.duplicated().sort_index()
0 False
1 False
2 True
3 False
4 True
dtype: bool
>>> animals.duplicated(keep='last').sort_index()
0 True
1 False
2 True
3 False
4 False
dtype: bool
>>> animals.duplicated(keep=False).sort_index()
0 True
1 False
2 True
3 False
4 True
dtype: bool
```
### How was this patch tested?
Unit tests.
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