fix(python) pl.min(['*']) and pl.max(['*']) cannot handle wildcards like pl.sum(["*"])

[sorhawell]

Polars version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of Polars.

Issue description

pl.min([str1,str2,str3,...]) and pl.max([str1,str2,str3,...]) have their own implementation which cannot handle a wildcard as it resolves the expression immediately.

This issue is fixed in this PR #5511 be using the pl.sum([...]) impl pattern on pl.min and pl.max. However someone should just check if this vector allocation is performance-wise ok.

Reproducible example

import polars as pl

fruits_cars =  pl.DataFrame({
"A": [1, 2, 3, 4, 5],
"fruits": ["banana", "banana", "apple", "apple", "banana"],
"B": [5, 4, 3, 2, 1],
"cars": ["beetle", "audi", "beetle", "beetle", "beetle"],
})


#try use wild card
fruits_cars.select([pl.col(pl.datatypes.Int64)]).select(pl.min(["*"]))

#hmm it just returned all columns untouched
shape: (5, 2)
┌─────┬─────┐
│ A   ┆ B   │
│ --- ┆ --- │
│ i64 ┆ i64 │
╞═════╪═════╡
│ 1   ┆ 5   │
├╌╌╌╌╌┼╌╌╌╌╌┤
│ 2   ┆ 4   │
├╌╌╌╌╌┼╌╌╌╌╌┤
│ 3   ┆ 3   │
├╌╌╌╌╌┼╌╌╌╌╌┤
│ 4   ┆ 2   │
├╌╌╌╌╌┼╌╌╌╌╌┤
│ 5   ┆ 1   │
└─────┴─────┘

#lets try to inspect the returned expression only
print(pl.min(["*"]))

#oh it returns the same as pl.col("*"), that is very unexpected
*

Expected behavior

def test_max_min_wildcard_columns(fruits_cars: pl.DataFrame) -> None:
    res = fruits_cars.select([pl.col(pl.datatypes.Int64)]).select(pl.min(["*"]))
    assert res.to_series(0).series_equal(pl.Series("min", [1, 2, 3, 2, 1]))
    res = fruits_cars.select([pl.col(pl.datatypes.Int64)]).select(pl.max(["*"]))
    assert res.to_series(0).series_equal(pl.Series("max", [5, 4, 3, 4, 5]))

Installed versions

---Version info---
Polars: 0.14.28
Index type: UInt32
Platform: macOS-10.16-x86_64-i386-64bit
Python: 3.8.0 (v3.8.0:fa919fdf25, Oct 14 2019, 10:23:27) 
[Clang 6.0 (clang-600.0.57)]
---Optional dependencies---
pyarrow: <not installed>
pandas: 1.3.3
numpy: 1.21.2
fsspec: <not installed>
connectorx: <not installed>
xlsx2csv: <not installed>
matplotlib: <not installed>

[ritchie46]

closed by #5511