Add option_context.

[ueshin]

No description provided.

[codecov-io]

Codecov Report

Merging #1077 into master will decrease coverage by <.01%.
The diff coverage is 92.3%.

@@            Coverage Diff            @@
##           master   #1077      +/-   ##
=========================================
- Coverage    95.2%   95.2%   -0.01%     
=========================================
  Files          34      34              
  Lines        6868    6880      +12     
=========================================
+ Hits         6539    6550      +11     
- Misses        329     330       +1

Impacted Files	Coverage Δ
databricks/koalas/__init__.py	87.23% <ø> (ø)	⬆️
databricks/koalas/frame.py	96.74% <ø> (ø)	⬆️
databricks/koalas/config.py	98.98% <92.3%> (-1.02%)	⬇️

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[HyukjinKwon]

I think we should document at docs/source/user_guide/options.rst too. Seems pandas has it too (https://pandas.pydata.org/pandas-docs/stable/user_guide/options.html).

Maybe we can fix some instances at "Operations on different DataFrames" too .. ?

[HyukjinKwon]

There seems one more instance in 10 mins too.

[ueshin]

I don't think we should add to 10 mins. It's an example for spark conf.

[HyukjinKwon]

LGTM otherwise. +1

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Softagram Impact Report for pull/1077 (head commit: 6d8f35b)

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⭐ Details of Dependency Changes

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💡 Insights

• Co-change Alert: You modified test_frame_plot.py. Often plot.py (databricks/koalas) is modified at the same time.
• Co-change Alert: You modified test_groupby.py. Often groupby.py (databricks/koalas) is modified at the same time.

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