index changed after merge

left_kdf = ks.DataFrame({'A': [1, 2]}, index = ['zero', 'one'])
left_kdf
         A
zero   1
one    2

right_kdf = ks.DataFrame({'B': ['x', 'y']}, index=['one', 'two'])
right_kdf
         B
one    x
two    y

left_kdf.merge(right_kdf, left_index=True, right_index=True)
       A     B
0     2     x

Index is changed. Expected answer is

left_kdf.merge(right_kdf, left_index=True, right_index=True)
       A     B
one     2     x

[RainFung]

Looks like something worth fixing to me. I can create a PR for this later today.

Hello floscha. If you fix this, i can add some simple function like join,reindex based on merge easily.

[floscha]

There was another corner case I was missing but it should be working now.