dchvn opened a new pull request #34212:
URL: https://github.com/apache/spark/pull/34212


   ### What changes were proposed in this pull request?
   
   Implement Series.combine
   
   ### Why are the changes needed?
   
   Increase pandas API coverage in PySpark
   ### Does this PR introduce _any_ user-facing change?
   
   User can use
   
   ```python
   >>> s1 = ps.Series({'falcon': 330.0, 'eagle': 160.0})
   >>> s1
   falcon    330.0
   eagle     160.0
   dtype: float64
   
   >>> s2 = ps.Series({'falcon': 345.0, 'eagle': 200.0, 'duck': 30.0})
   >>> s2
   falcon    345.0
   eagle     200.0
   duck       30.0
   dtype: float64
   
   >>> s1.combine(s2, max)
   duck        NaN
   eagle     200.0
   falcon    345.0
   dtype: float64
   ```
   ### How was this patch tested?
   
   unit tests and docstest


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