Multiplication not allowed for bool dtype

[jesusestevez]

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

df = pl.DataFrame(
    {"sets": [["a", "b"], ["a", "b"], ["a", "b"]], 
     "optional_members": [["a", "b"], ["a", "b"], ["a", "c"]],
     "exposure": [[1, 2], [3, 4], [5, 6]]}
)

lookup = df.with_columns(
    pl.col.sets.explode().is_in(pl.col.optional_members.explode())
    .implode()
    .over(pl.int_range(pl.len()))
    .alias("lookup_result")
)


lookup.with_columns(pl.col("lookup_result") * pl.col("exposure"))

Log output

No response

Issue description

Following #8006 , I would expect list multiplication to be allowed for boolean dtypes, behaving as the list division. However, it seems it is not supported. Is there any reason for this behaviour?

Expected behavior

I would expect the multiplication (when one of the columns is bool dtype, to behave as the division:

import polars as pl

df = pl.DataFrame(
    {"sets": [["a", "b"], ["a", "b"], ["a", "b"]], 
     "optional_members": [["a", "b"], ["a", "b"], ["a", "c"]],
     "exposure": [[1, 2], [3, 4], [5, 6]]}
)

lookup = df.with_columns(
    pl.col.sets.explode().is_in(pl.col.optional_members.explode())
    .implode()
    .over(pl.int_range(pl.len()))
    .alias("lookup_result")
)


lookup.with_columns(pl.col("lookup_result") / pl.col("exposure"))

Installed versions

Replace this line with the output of pl.show_versions(). Leave the backticks in place.

[cmdlineluser]

It doesn't mention what error you get or the pl.show_versions() output, but this is what I get on 1.14.0

lookup.with_columns(pl.col("lookup_result") * pl.col("exposure"))
# shape: (3, 4)
# ┌────────────┬──────────────────┬───────────┬───────────────┐
# │ sets       ┆ optional_members ┆ exposure  ┆ lookup_result │
# │ ---        ┆ ---              ┆ ---       ┆ ---           │
# │ list[str]  ┆ list[str]        ┆ list[i64] ┆ list[i64]     │
# ╞════════════╪══════════════════╪═══════════╪═══════════════╡
# │ ["a", "b"] ┆ ["a", "b"]       ┆ [1, 2]    ┆ [1, 2]        │
# │ ["a", "b"] ┆ ["a", "b"]       ┆ [3, 4]    ┆ [3, 4]        │
# │ ["a", "b"] ┆ ["a", "c"]       ┆ [5, 6]    ┆ [5, 0]        │
# └────────────┴──────────────────┴───────────┴───────────────┘

[jesusestevez]

I missed an update. Thanks for the feedback!