ENH: Add scatter plot for Frame

[charlesdong1991]

[charlesdong1991]

ideally, should use docstring with is identical to what pandas have, however, i encountered quite annoying linting error issue with docstring which I have no idea how to fix, so for now, i keep s and c docstring very simple. Will change/complete them in future PR where I update docstring for all functions.

[codecov-io]

Codecov Report

Merging #719 into master will decrease coverage by 1.75%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
- Coverage   94.18%   92.43%   -1.76%     
==========================================
  Files          32       32              
  Lines        5559     5567       +8     
==========================================
- Hits         5236     5146      -90     
- Misses        323      421      +98

Impacted Files	Coverage Δ
databricks/koalas/plot.py	94.91% <100%> (+0.11%)	⬆️
databricks/koalas/usage_logging/__init__.py	23.14% <0%> (-74.08%)	⬇️
databricks/koalas/usage_logging/usage_logger.py	50% <0%> (-50%)	⬇️
databricks/koalas/__init__.py	77.5% <0%> (-7.5%)	⬇️
databricks/conftest.py	93.02% <0%> (-4.66%)	⬇️
databricks/koalas/internal.py	95.83% <0%> (-0.47%)	⬇️

---

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[HyukjinKwon]

I think we can remove this.

[charlesdong1991]

ahh, yeah, removed. and added pics in description, i thought i did it yesterday. my bad

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[HyukjinKwon]

@charlesdong1991, before we merge, can you check if Koalas plot adds "showing top 1,000 elements only" in the output chart when the rows are larger than 1000?

[charlesdong1991]

@HyukjinKwon good call! cannot really read it because font size is a bit too small to me 😅 but we probably can tell from density of points that koalas plot less.

[HyukjinKwon]

Thanks for testing it out, @charlesdong1991.

[Ankurneural]

How to use all the rows for the plot?
Setting, ks.set_option('compute.max_rows', 50000)
ks.set_option("display.max_rows", 50000) seems not to be working

[HyukjinKwon]

plotting.max_rows should work for that. There's a documentation here - https://koalas.readthedocs.io/en/latest/user_guide/options.html#available-options

[Ankurneural]

plotting.max_rows should work for that. There's a documentation here - https://koalas.readthedocs.io/en/latest/user_guide/options.html#available-options
Thanks! I somehow missed it. It is working as anticipated.

[Ankurneural]

@HyukjinKwon I am trying to make subplots using Koalas Dataframe but it comes blank.
d1 is a koalas dataframe.
Sample Code:
fig, (ax1, ax2) = plt.subplots(1, 2)
ax1 = d1.plot.scatter(x="col1", y="col2")
ax2 = d1.plot.scatter(x="col1", y="col2")
display(fig)

Any suggestions or help on this?

[HyukjinKwon]

@Ankurneural can you create a new ticket with the full codes and output?