Add plot.barh in Series

[HyukjinKwon]

This PR add series.plot.barh in Series.

Can be tested as below:

import databricks.koalas as ks

kdf = ks.range(10)
kdf.to_pandas()['id'].plot.barh(colormap='Paired').figure.savefig("image1.png")
kdf['id'].plot.barh(colormap='Paired').figure.savefig("image2.png")

In case of this plot, we sample and match the row numbers around 1000.

import databricks.koalas as ks

ks.range(1001)['id'].plot.barh(colormap='Paired').figure.savefig("image3.png")

Partially addresses #665

[HyukjinKwon]

Those 5 PRs will complete Series.plot.*. I will make a followup to deduplicate and clean up them after merging all of them.

[HyukjinKwon]

I am merging this for today's release but please feel free to review after it's merged.

[softagram-bot]

Softagram Impact Report for pull/673 (head commit: 0b58372)

⭐ Change Overview

(Open in Softagram Desktop for full details)

📄 Full report

• Permalink: Full report for pull/673

Give feedback on this report to [email protected]