Version 0.19.0

Koalas Logo

Now that we have an official logo!

We can see the cute logo in our documents as well.

Documentation

Also we improved the documentation: https://koalas.readthedocs.io/en/latest/

• Added the logo (#831)

• Added a Jupyter notebook for 10 min tutorial (#843)

• Added the tutorial to the documentation (#853)

• Add some examples for plot implementations in their docstrings (#847)

• Move contribution guide to the official documentation site (#841)

Binder integration for the 10 min tutorial

You can run a live Jupyter notebook for 10 min tutorial from .

Multi-index columns support

We continue improving multi-index columns support. We made the following APIs support multi-index columns:

• transform (#800)

• round (#802)

• unique (#809)

• duplicated (#803)

• assign (#811)

• merge (#825)

• plot (#830)

• groupby and its functions (#833)

• update (#848)

• join (#848)

• drop_duplicate (#856)

• dtype (#858)

• filter (#859)

• dropna (#857)

• replace (#860)

Plots

We also continue adding plot APIs as follows:

For DataFrame:

• plot.kde() (#784)

Other new features and improvements

We added the following new features:

koalas.DataFrame:

• pop (#791)

• __iter__ (#836)

• rename (#806)

• expanding (#840)

• rolling (#840)

koalas.Series:

• aggregate (#816)

• agg (#816)

• expanding (#840)

• rolling (#840)

• drop (#829)

• copy (#869)

koalas.DataFrameGroupBy:

• expanding (#840)

• rolling (#840)

koalas.SeriesGroupBy:

• expanding (#840)

• rolling (#840)

Along with the following improvements:

• Add squeeze argument to read_csv (#812)

• Raise a more helpful error for duplicated columns in Join (#820)

• Issue with ks.merge to Series (#818)

• Fix MultiIndex.to_pandas() and __repr__(). (#832)

• Add unit and origin options for to_datetime (#839)

• Fix on wrong error raise in DataFrame.fillna (#844)

• Allow str and list in aggfunc in DataFrameGroupby.agg (#828)

• Add index_col argument to to_koalas(). (#863)

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