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Comments (2)

coastalwhite avatar coastalwhite commented on June 25, 2024 2

Can confirm that it does an invalid transformation in cluster_with_columns. I will see if I can fix it tomorrow.

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cmdlineluser avatar cmdlineluser commented on June 25, 2024

Can reproduce.

It seems related to the new cluster_with_columns optimization as it works when disabled.

(
    pl.LazyFrame({
        "col1": [None, True]
    })
    .with_columns(
        col1=pl.lit(False)
    )
    .with_columns(
        pl.when(
            ~pl.col("col1")
        )
        .then(pl.lit(True))
        .otherwise(pl.lit(False))
        .alias("col2")
    )
    .with_columns(col2=pl.lit(False))
    .collect(cluster_with_columns=False)
)

# shape: (2, 2)
# ┌───────┬───────┐
# │ col1  ┆ col2  │
# │ ---   ┆ ---   │
# │ bool  ┆ bool  │
# ╞═══════╪═══════╡
# │ false ┆ false │
# │ false ┆ false │
# └───────┴───────┘

(cc: @coastalwhite - hope it's OK to ping, I saw that you fixed the previous CWC issues)

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