Bryan Cardillo comments

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                                            Bryan Cardillo

Export to CSV does not write row names

So, turns out this writing the index is not supported by the csv library joinery uses. There is a workaround, you can add the index as a new column prior...

Can the writecsv() function specify a separator?

Looks like this was missed when adding the `separator` parameter to the `readCsv` methods. I'll add it.

Concatenate two dataframes with same columns

Does [append](http://cardillo.github.io/joinery/v1.9/api/reference/joinery/DataFrame.html#append(java.util.List%3C?%20extends%20V%3E)) give the desired result?

Concatenate two dataframes with same columns

Agree, not ideal, but should get you going today. I'll look at adding a more efficient `concat` implementation to next release.

Concatenate two dataframes with same columns

Thanks @jihoonkang0829, please submit a PR when you're ready.

Update license to add linking exception or dual license under Apache

This project was written while I was employed by IBM, using IBM resources, and for use within an IBM services offering; so IBM hold the copyright to that work and...

Update license to add linking exception or dual license under Apache

Ok, I'm looking into the possibility of adding a linking exception or dual licensing under an Apache license. I'll post the outcome here.

How could I join two data frames by specfying columns from each data frame ?

Try using the `joinOn` method with the column names for which the values match. Alternatively, you can use the `joinOn` method with a function that computes the join key.