Description
Pandas version checks
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I have checked that this issue has not already been reported.
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I have confirmed this bug exists on the latest version of pandas.
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I have confirmed this bug exists on the main branch of pandas.
Reproducible Example
import pandas as pd
ri = pd.RangeIndex(10, 0, -1)
result = ri.searchsorted(5)
print(result) # prints 5 in current main branch, but 0 in pandas 2.2.2Issue Description
The behavior of the above example has changed with #58376, which was supposed to only improve performance. My understanding of the API documentation is that the new behavior is correct, i.e., #58376 coincidentally fixed this bug.
However, the bug is still present in the latest version (2.2.2). It may be worth backporting a fix into the 2.2.x branch.
Expected Behavior
The index is [10, 9, 8, 7, 6, 5, 4, 3, 2, 1] . Since the RangeIndex is sorted in descending order, searchsorted(5) should return the index where 5 would fit, which is 5. However, pandas 2.2.2 returns 0.
Installed Versions
pandas : 2.2.2
numpy : 1.26.4
pytz : 2024.1
dateutil : 2.9.0.post0
setuptools : 68.1.2
pip : 23.2
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : None
IPython : None
pandas_datareader : None
adbc-driver-postgresql: None
adbc-driver-sqlite : None
bs4 : None
bottleneck : None
dataframe-api-compat : None
fastparquet : None
fsspec : None
gcsfs : None
matplotlib : None
numba : None
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pyreadstat : None
python-calamine : None
pyxlsb : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
tabulate : None
xarray : None
xlrd : None
zstandard : None
tzdata : 2024.1
qtpy : None
pyqt5 : None