pandas merge appear non-existent value the column b should not have value '1'

[ghost]

Code Sample, a copy-pastable example if possible

t = [1, 2, 3, 4, 5]

tt = [2, 3, 4, 5, 7]

d1 = DataFrame(t, columns=['a'], index=t)

d2 = DataFrame(tt, columns=['b'])

r = pd.merge(d1, d2, how='left', left_index=True, right_on='b', copy=False)

print(r)
pd.show_versions()

Expected Output

/usr/local/Cellar/python3/3.5.0/Frameworks/Python.framework/Versions/3.5/bin/python3.5 /var/root/finalworkspace/python/daas/core/process_data.py
a b
4 1 1.0
0 2 2.0
1 3 3.0
2 4 4.0
3 5 5.0

output of pd.show_versions()

INSTALLED VERSIONS

commit: None
python: 3.5.0.final.0
python-bits: 64
OS: Darwin
OS-release: 14.5.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: None
LANG: None

pandas: 0.18.1
nose: None
pip: 8.1.2
setuptools: 25.1.4
Cython: None
numpy: 1.11.1
scipy: None
statsmodels: None
xarray: None
IPython: None
sphinx: None
patsy: None
dateutil: 2.5.3
pytz: 2016.6.1
blosc: None
bottleneck: None
tables: None
numexpr: None
matplotlib: 1.5.1
openpyxl: None
xlrd: None
xlwt: None
xlsxwriter: None
lxml: None
bs4: None
html5lib: None
httplib2: None
apiclient: None
sqlalchemy: None
pymysql: 0.6.7.None
psycopg2: None
jinja2: 2.8
boto: None
pandas_datareader: None

Process finished with exit code 0

[Dr-Irv]

This is related to the discussion in #13371.

[mroeschke]

Since #13371 is further along in the discussion, closing in favor of that issue