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Casting String to List(...) does not raise #21510

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2 tasks done
cmdlineluser opened this issue Feb 27, 2025 · 0 comments
Open
2 tasks done

Casting String to List(...) does not raise #21510

cmdlineluser opened this issue Feb 27, 2025 · 0 comments
Labels
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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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.select(pl.lit("foo").cast(pl.List(pl.Float64)))

# shape: (1, 1)
# ┌───────────┐
# │ literal   │
# │ ---       │
# │ list[f64] │
# ╞═══════════╡
# │ [null]    │
# └───────────┘

Log output

Issue description

Should this not raise an error?

pl.select(pl.lit("foo").cast(pl.List(pl.String)))

# shape: (1, 1)
# ┌───────────┐
# │ literal   │
# │ ---       │
# │ list[str] │
# ╞═══════════╡
# │ ["foo"]   │
# └───────────┘

Expected behavior

InvalidOperationError

Installed versions

--------Version info---------
Polars:              1.23.0
Index type:          UInt32
Platform:            macOS-13.6.1-arm64-arm-64bit-Mach-O
Python:              3.13.0 (main, Oct  7 2024, 05:02:14) [Clang 15.0.0 (clang-1500.1.0.2.5)]
LTS CPU:             False

----Optional dependencies----
adbc_driver_manager  <not installed>
altair               <not installed>
boto3                <not installed>
cloudpickle          <not installed>
connectorx           <not installed>
deltalake            <not installed>
fastexcel            0.12.0
fsspec               <not installed>
gevent               <not installed>
google.auth          <not installed>
great_tables         0.14.0
matplotlib           <not installed>
nest_asyncio         <not installed>
numpy                2.1.3
openpyxl             3.1.5
pandas               2.2.3
pyarrow              18.0.0
pydantic             <not installed>
pyiceberg            <not installed>
sqlalchemy           <not installed>
torch                <not installed>
xlsx2csv             <not installed>
xlsxwriter           3.2.0
@cmdlineluser cmdlineluser added bug Something isn't working needs triage Awaiting prioritization by a maintainer python Related to Python Polars labels Feb 27, 2025
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Labels
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