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Segfault / PanicException with pl.lit + .slice in a group by context #17217

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2 tasks done
cmdlineluser opened this issue Jun 26, 2024 · 0 comments · Fixed by #17242
Closed
2 tasks done

Segfault / PanicException with pl.lit + .slice in a group by context #17217

cmdlineluser opened this issue Jun 26, 2024 · 0 comments · Fixed by #17242
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accepted Ready for implementation bug Something isn't working needs triage Awaiting prioritization by a maintainer python Related to Python Polars

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@cmdlineluser
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  • 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.DataFrame({'idx': [1, 2, 3]}).group_by(True).agg(
    x = pl.lit([1, 2]).slice(-1, 1)
)

Log output

No response

Issue description

Found while trying to repro #17198 (not sure if it is the same underlying issue).

The provided example flips between PanicException: capacity overflow and segfaulting.

If a pl.Series is used inside the .lit call the result is a non-deterministic junk value:

pl.DataFrame({'idx': [1, 2, 3]}).group_by(True).agg(
    x = pl.lit(pl.Series([1, 2])).slice(-1, 1)
)

# shape: (1, 2)
# ┌─────────┬───────────────────────┐
# │ literal ┆ x                     │
# │ ---     ┆ ---                   │
# │ bool    ┆ list[i64]             │
# ╞═════════╪═══════════════════════╡
# │ true    ┆ [7310875413193069794] │
# └─────────┴───────────────────────┘

Expected behavior

No error.

Installed versions

--------Version info---------
Polars:               1.0.0-rc.2
Index type:           UInt32
Platform:             macOS-13.6.1-arm64-arm-64bit
Python:               3.12.2 (main, Feb  6 2024, 20:19:44) [Clang 15.0.0 (clang-1500.1.0.2.5)]

----Optional dependencies----
adbc_driver_manager:  <not installed>
cloudpickle:          <not installed>
connectorx:           <not installed>
deltalake:            <not installed>
fastexcel:            <not installed>
fsspec:               <not installed>
gevent:               <not installed>
great_tables:         <not installed>
hvplot:               <not installed>
matplotlib:           <not installed>
nest_asyncio:         <not installed>
numpy:                1.26.4
openpyxl:             <not installed>
pandas:               2.2.1
pyarrow:              15.0.2
pydantic:             <not installed>
pyiceberg:            <not installed>
sqlalchemy:           <not installed>
torch:                <not installed>
xlsx2csv:             <not installed>
xlsxwriter:           <not installed>
@cmdlineluser cmdlineluser added bug Something isn't working needs triage Awaiting prioritization by a maintainer python Related to Python Polars labels Jun 26, 2024
@ritchie46 ritchie46 self-assigned this Jun 27, 2024
@c-peters c-peters added the accepted Ready for implementation label Jul 1, 2024
@c-peters c-peters added this to Backlog Jul 1, 2024
@c-peters c-peters moved this to Done in Backlog Jul 1, 2024
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Labels
accepted Ready for implementation bug Something isn't working needs triage Awaiting prioritization by a maintainer python Related to Python Polars
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3 participants