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Description
Checks
- I have checked that this issue has not already been reported.
- I have confirmed this bug exists on the latest version of Polars.
Reproducible example
import polars as pl
pl.string_cache.enable_string_cache()
df1 = pl.DataFrame({
"a": ["a", "b", "c"],
}).cast(pl.Categorical(ordering="lexical"))
df2 = pl.DataFrame({
"a": ["a", "b", "d"],
}).cast(pl.Categorical(ordering="lexical"))
df = df1.merge_sorted(df2, key="a")
print(df) Log output
thread '<unnamed>' panicked at crates/polars-core/src/chunked_array/logical/categorical/revmap.rs:99:42:
called `Option::unwrap()` on a `None` value
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Traceback (most recent call last):
File "/home/mag/repos/my_repo/testit.py", line 12, in <module>
print(df)
File "/home/mag/miniconda3/envs/myenv/lib/python3.12/site-packages/polars/dataframe/frame.py", line 1188, in __str__
return self._df.as_str()
^^^^^^^^^^^^^^^^^
pyo3_runtime.PanicException: called `Option::unwrap()` on a `None` valueIssue description
Likely introduced recently, after 0.45.1 (Rust).
Expected behavior
shape: (6, 1)
┌─────┐
│ a │
│ --- │
│ cat │
╞═════╡
│ a │
│ a │
│ b │
│ b │
│ c │
│ d │
└─────┘
Installed versions
--------Version info---------
Polars: 1.26.0
Index type: UInt32
Platform: Linux-6.11.0-19-generic-x86_64-with-glibc2.39
Python: 3.12.8 | packaged by Anaconda, Inc. | (main, Dec 11 2024, 16:31:09) [GCC 11.2.0]
LTS CPU: False
----Optional dependencies----
Azure CLI 2.70.0
adbc_driver_manager <not installed>
altair 5.5.0
azure.identity 1.21.0
boto3 <not installed>
cloudpickle <not installed>
connectorx <not installed>
deltalake <not installed>
fastexcel <not installed>
fsspec <not installed>
gevent <not installed>
google.auth 2.38.0
great_tables <not installed>
matplotlib <not installed>
numpy 1.26.4
openpyxl 3.1.5
pandas 2.2.3
polars_cloud <not installed>
pyarrow 16.1.0
pydantic 2.10.5
pyiceberg <not installed>
sqlalchemy 2.0.39
torch <not installed>
xlsx2csv <not installed>
xlsxwriter <not installed>
None