repeat_by does not work with pl.lit

[markxwang]

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

pl.DataFrame({"a": [2, 3, 4]}).select(pl.lit("*").repeat_by(pl.col("a")))

Issue description

ComputeError: Length of repeat_by argument needs to be 1 or equal to the length of the Series. Series length 1, by length 3

Expected behavior

Expect to return a series of lists where the * literal is repeated by column a

Installed versions

--------Version info---------
Polars:      0.18.4
Index type:  UInt32
Platform:    macOS-13.3.1-arm64-arm-64bit
Python:      3.10.5 (main, Sep  6 2022, 09:52:19) [Clang 13.1.6 (clang-1316.0.21.2.5)]

----Optional dependencies----
numpy:       1.23.4
pandas:      2.0.0
pyarrow:     10.0.0
connectorx:  <not installed>
deltalake:   <not installed>
fsspec:      <not installed>
matplotlib:  3.6.2
xlsx2csv:    <not installed>
xlsxwriter:  <not installed>```

</details>

[deanm0000]

This is intended. See #6360

To make it work as expected, create the column first like this:

(
    pl.DataFrame({"a": [2, 3, 4]})
        .with_columns(s=pl.lit('*'))
        .select(pl.col('s').repeat_by(pl.col('a')))
        )

[cmdlineluser]

Just browsing old issues, this was implemented in #10735 and can be closed.

pl.DataFrame({"a": [2, 3, 4]}).select(pl.lit("*").repeat_by(pl.col("a")))

# shape: (3, 1)
# ┌───────────────────┐
# │ literal           │
# │ ---               │
# │ list[str]         │
# ╞═══════════════════╡
# │ ["*", "*"]        │
# │ ["*", "*", "*"]   │
# │ ["*", "*", … "*"] │
# └───────────────────┘

[romanovacca]

@stinodego can be closed