Series.fillna

[garawalid]

• Implementation of Series.fillna() Series.fillna #308
• Docstring with examples

[garawalid]

It turns out that Pandas.Series.fillna supports neither Series nor dict as value.
Koalas.Series.fillna does!

[codecov-io]

Codecov Report

Merging #317 into master will increase coverage by 0.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #317      +/-   ##
==========================================
+ Coverage   93.81%   94.06%   +0.24%     
==========================================
  Files          34       35       +1     
  Lines        3315     3454     +139     
==========================================
+ Hits         3110     3249     +139     
  Misses        205      205

Impacted Files	Coverage Δ
databricks/koalas/missing/series.py	100% <ø> (ø)	⬆️
databricks/koalas/series.py	92.92% <100%> (+0.61%)	⬆️
databricks/koalas/tests/test_series.py	100% <100%> (ø)	⬆️
databricks/koalas/exceptions.py	78.12% <0%> (-1.29%)	⬇️
databricks/koalas/missing/frame.py	100% <0%> (ø)	⬆️
databricks/koalas/tests/test_series_conversion.py	100% <0%> (ø)	⬆️
...tabricks/koalas/tests/test_dataframe_conversion.py	100% <0%> (ø)	⬆️
databricks/koalas/tests/test_dataframe.py	100% <0%> (ø)	⬆️
... and 3 more

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[rxin]

i think we should just follow pandas here and drop dict/Series. This is a Series, so there's only one column really.

[garawalid]

@rxin
Pandas doc says that it supports dict & Series.
But I think the doc is a copy paste of DataFrame.fillna.

Anyway, we can remove them from the docstring.

[garawalid]

@rxin I left only scalar as values.

[rxin]

Thanks. I've merged this. This will be available as part of release 0.4.