Haejoon Lee comments

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                                            Haejoon Lee

pandas.crosstab absent for Koalas

I'm working on this.

pandas.crosstab absent for Koalas

@shlok-dev 1. actually the release schedule is up to maintainers of Koalas like @HyukjinKwon , @ueshin . (since I'm not a maintainer of this repository 😄 ) 2. and currently...

pandas.crosstab absent for Koalas

@shlok-dev It's my pleasure. thanks for understanding :)

pandas.crosstab absent for Koalas

@leihuang Thanks for sharing!

Column names with "_" raises KeyError in pivot_table

Thanks for the report!! Seems like bug in Koalas, we should fix this.

Not support rename DataFrame.columns assigning directly.

FYI. koalas can change name of columns like this, ```python >>> kdf.columns = kdf.columns.rename('column_renamed') ``` or like that ```python >>> tmp_columns = kdf.columns >>> tmp_columns.name = 'column_renamed' >>> kdf.columns =...

groupby.diff with datetime column

@HyukjinKwon , Seems like SPARK-24695 is resolved, can we support calendar in Koalas now ??

Whether the `apply` function is implemented using the pandas_udf function?

Yeah, for some case we use `mapInPandas` which leveraging the `pandas_udf` internally. https://github.com/databricks/koalas/blob/07d846225d27492a9b85e58900018fda576650e3/databricks/koalas/frame.py#L2557-L2563

from_pandas does not recognize index with timezone

Unfortunately, Koalas doesn't support `DatetimeIndex` with specifying timezone yet. `DatetimeIndex` is a feature recently added to more strictly support data types, and there are still many missing features for now.

Koalas.read_*() methods replace path(type:str)

@HyukjinKwon , Should we add a note to our documents that we don't want to support this, and close this issue ?