[BUG] Appending along columns not working without suffix argument

[Priya2698]

Appending to a DataPanel along columns does not work without suffix argument even when the column names do not overlap.

dp = ms.DataPanel({
    'text': ['The quick brown fox.', 'Jumped over.', 'The lazy dog.'],
    'label': [0, 1, 0]
})
dp2 = ms.DataPanel({
    'string': ['The quick brown fox.', 'Jumped over.', 'The lazy dog.'],
    'target': [0, 1, 0]
})
dp.append(dp2, axis=1)

This code throws ValueError. It works when I provide any suffix, although they are not used.

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-18-5f32282aa054> in <module>()
----> 1 dp.append(dp2, axis=1)

1 frames
/usr/local/lib/python3.7/dist-packages/mosaic/datapanel.py in append(self, dp, axis, suffixes, overwrite)
    422             if not overwrite and shared:
    423                 if suffixes is None:
--> 424                     raise ValueError()
    425                 left_suf, right_suf = suffixes
    426                 data = {

ValueError:

[Priya2698]

The "index" column is always a shared column between any two DataPanels, hence suffixes are always needed right now

[seyuboglu]

This is now example is now working smoothly in dev