cache implementation in databricks.koalas namespace

[shril]

PR #333

[codecov-io]

Codecov Report

Merging #398 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
+ Coverage   93.06%   93.09%   +0.02%     
==========================================
  Files          27       27              
  Lines        3344     3358      +14     
==========================================
+ Hits         3112     3126      +14     
  Misses        232      232

Impacted Files	Coverage Δ
databricks/koalas/__init__.py	92.85% <ø> (ø)	⬆️
databricks/koalas/namespace.py	90.75% <100%> (+0.57%)	⬆️

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[shril]

@HyukjinKwon, can you please help me out here?
The build is failing in some update statement -

The command "sudo apt-get update" failed and exited with 100 during .

[HyukjinKwon]

I retriggered the job but actually I was thinking about avoiding to add it into name space. Let's get the dataframe one first.

[shril]

Hi @HyukjinKwon, the dataframe one is done.
Will we proceed with this one too or will we just go with the dataframe one?

@rxin can we have your insights here?

[HyukjinKwon]

Let's get #397 in first anyway.

[shril]

@HyukjinKwon, I am okay with either of them.

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[shril]

@ueshin Can you have a look here also?

[ueshin]

Actually I don't think we still need this if df.cache() can work with with as @HyukjinKwon suggested.

[HyukjinKwon]

Let's close this for now. I think df.cache() with context manager is powerful enough.