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The problem is triggered in libjoin.left_join_indexer(left, right), where both left and right have dtype(int8), which raises the TypeError: No matching signature found.
Code Sample, a copy-pastable example if possible
Problem description
The problem is triggered in
libjoin.left_join_indexer(left, right)
, where bothleft
andright
havedtype(int8)
, which raises theTypeError: No matching signature found
.Interestingly enough, if you change from
pd.merge(pdf, agg, how="left", left_index=True, right_index=True)
to
pd.merge(pdf, agg, how="left", on="idx")
everything works fine as demonstrated below.
Expected Output
Output of
pd.show_versions()
INSTALLED VERSIONS
commit : None
pandas : 0.25.1
numpy : 1.16.3
pytz : 2019.1
dateutil : 2.7.5
pip : 19.1.1
setuptools : 41.0.1
Cython : 0.29.13
pytest : None
hypothesis : None
sphinx : 2.2.0
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : 1.0.1
pymysql : None
psycopg2 : None
jinja2 : 2.10
IPython : 7.5.0
pandas_datareader: None
bs4 : None
bottleneck : None
fastparquet : None
gcsfs : None
lxml.etree : None
matplotlib : 3.1.1
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pytables : None
s3fs : None
scipy : 1.3.0
sqlalchemy : None
tables : None
xarray : None
xlrd : None
xlwt : None
xlsxwriter : None
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