CI failure due to test_streaming_unique.py::test_streaming_out_of_core_unique

[mcrumiller]

Ref #13526. Sorry, there's another one :(

Reproducible example

pytest -m "" tests/unit/streaming/test_streaming_unique.py::test_streaming_out_of_core_unique

Log output

(.venv) mcrumiller@Saline-PC:~/projects/polars/py-polars$ pytest -m "" tests/unit/streaming/test_streaming_unique.py::test_streaming_out_of_core_unique
=================================================================================================================================================== test session starts ===================================================================================================================================================
platform linux -- Python 3.11.3, pytest-7.4.0, pluggy-1.3.0
rootdir: /home/mcrumiller/projects/polars/py-polars
configfile: pyproject.toml
plugins: hypothesis-6.92.1, xdist-3.5.0, cov-4.1.0
collected 1 item                                                                                                                                                                                                                                                                                                          

tests/unit/streaming/test_streaming_unique.py F                                                                                                                                                                                                                                                                     [100%]

======================================================================================================================================================== FAILURES =========================================================================================================================================================
____________________________________________________________________________________________________________________________________________ test_streaming_out_of_core_unique ____________________________________________________________________________________________________________________________________________
tests/unit/streaming/test_streaming_unique.py:28: in test_streaming_out_of_core_unique
    df1 = q.join(q.head(1000), how="cross").unique().collect(streaming=True)
polars/lazyframe/frame.py:1730: in collect
    return wrap_df(ldf.collect())
E   pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: SchemaMismatch(ErrString("invalid series dtype: expected `BinaryOffset`, got `binary`"))
-------------------------------------------------------------------------------------------------------------------------------------------------- Captured stdout call ---------------------------------------------------------------------------------------------------------------------------------------------------
run UnionExec
UNION: `parallel=false` union is run sequentially
run UdfExec
-------------------------------------------------------------------------------------------------------------------------------------------------- Captured stderr call ---------------------------------------------------------------------------------------------------------------------------------------------------
file < 128 rows, no statistics determined
no. of chunks: 1 processed by: 1 threads.
file < 128 rows, no statistics determined
no. of chunks: 1 processed by: 1 threads.
file < 128 rows, no statistics determined
no. of chunks: 1 processed by: 1 threads.
file < 128 rows, no statistics determined
no. of chunks: 1 processed by: 1 threads.
file < 128 rows, no statistics determined
no. of chunks: 1 processed by: 1 threads.
RUN STREAMING PIPELINE
df -> cross_join_sink
RefCell { value: [df -> placeholder -> slice_sink -> fast_projection -> cross_join_sink, df -> cross_join_sink, df -> placeholder -> slice_sink -> fast_projection -> slice_sink -> placeholder -> re-project-sink -> ordered_sink] }
OOC group_by started
Temporary directory path in use: /tmp
OOC group_by started
Temporary directory path in use: /tmp
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
OOC group_by started
process partition 0 during generic-group_by-source
thread '<unnamed>' panicked at crates/polars-pipe/src/executors/sinks/group_by/generic/mod.rs:97:44:
called `Result::unwrap()` on an `Err` value: SchemaMismatch(ErrString("invalid series dtype: expected `BinaryOffset`, got `binary`"))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
================================================================================================================================================= short test summary info =================================================================================================================================================
FAILED tests/unit/streaming/test_streaming_unique.py::test_streaming_out_of_core_unique - pyo3_runtime.PanicException: called `Result::unwrap()` on an `Err` value: SchemaMismatch(ErrString("invalid series dtype: expected `BinaryOffset`, got `binary`"))
==================================================================================================================================================== 1 failed in 6.73s ====================================================================================================================================================

Issue description

This test is failing consistently.

Expected behavior

Should pass.

Installed versions

main

[mcrumiller]

I think @ritchie46 is our best hope as it appears to be related to the new string implementation.

[stinodego]

Actually I broke this in #13961 by moving the pytest markers. Should be fixed with #13974.

If you can manage to reproduce the error outside of pytest, I'd be interested to see a bug report though!

[mcrumiller]

Ahh good, glad it was not a serious issue.