join on empty dataframe returns an array instead of an empty dataset

[fgutmann]

When joining with an empty dataframe the result is an array.
I'd expect it to be an empty dataframe.

Example:

let df1 = new dfjs.DataFrame([]);
let df2 = new dfjs.DataFrame([]);
df1.join(df2, 'col1'); // empty array

The empty array is quite unhandy in situations where filter() is followed by join().
What are your thoughts on this?

[Gmousse]

Hum it's clearly a bug.
thanks @fgutmann I will see for a fix when I can find some free time.

[Gmousse]

It was fixed on this PR.

I will investigate on other reduce / groupBy issues with empty (or with one element) DataFrame.

I hope a release on monday.

[fgutmann]

Thanks for being that fast 👍
A release would would be awesome too!

[Gmousse]

Fixed and published in 1.3.2