Allow to mixing series and expressions in withColumns

[sezanzeb]

All tests are passing.

Also tested it on my own, and it worked flawlessly:

	const df = pl.DataFrame(
		{
			"foo": [1, 2, 5],
			"bar": [6, 7, 8],
			"ham": ["a", "b", "c"]
		}
	).lazy()

	console.log(await df.withColumns(
		pl.col('foo').alias('foo2'),
		pl.Series('qux', [1, 2, 3]),
		pl.col('bar').alias('bar2'),
	).collect())

	const df = pl.DataFrame(
		{
			"foo": [1, 2, 5],
			"bar": [6, 7, 8],
			"ham": ["a", "b", "c"]
		}
	)

	console.log(df.withColumns(
		pl.col('foo').alias('foo2'),
		pl.Series('qux', [1, 2, 3]),
		pl.col('bar').alias('bar2'),
	))

shape: (3, 6)
┌─────┬─────┬─────┬─────┬──────┬──────┐
│ foo ┆ bar ┆ ham ┆ qux ┆ foo2 ┆ bar2 │
│ --- ┆ --- ┆ --- ┆ --- ┆ ---  ┆ ---  │
│ f64 ┆ f64 ┆ str ┆ f64 ┆ f64  ┆ f64  │
╞═════╪═════╪═════╪═════╪══════╪══════╡
│ 1.0 ┆ 6.0 ┆ a   ┆ 1.0 ┆ 1.0  ┆ 6.0  │
├╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌╌┤
│ 2.0 ┆ 7.0 ┆ b   ┆ 2.0 ┆ 2.0  ┆ 7.0  │
├╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌╌┤
│ 5.0 ┆ 8.0 ┆ c   ┆ 3.0 ┆ 5.0  ┆ 8.0  │
└─────┴─────┴─────┴─────┴──────┴──────┘

There are more places with similar usage of the spread operator (using the search regex , \.\.\. finds them), and isExprArray and isDataFrameArray could be changed as well to use every(...), but I wanted to avoid possibly breaking stuff that I haven't used yet.

[sezanzeb]

Empty withColumns call works fine:

const df = pl.DataFrame(
	{
		"foo": [1, 2, 5],
		"bar": [6, 7, 8],
		"ham": ["a", "b", "c"]
	}
)

console.log(df.withColumns())

shape: (3, 3)
┌─────┬─────┬─────┐
│ foo ┆ bar ┆ ham │
│ --- ┆ --- ┆ --- │
│ f64 ┆ f64 ┆ str │
╞═════╪═════╪═════╡
│ 1.0 ┆ 6.0 ┆ a   │
├╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┤
│ 2.0 ┆ 7.0 ┆ b   │
├╌╌╌╌╌┼╌╌╌╌╌┼╌╌╌╌╌┤
│ 5.0 ┆ 8.0 ┆ c   │
└─────┴─────┴─────┘

[kymckay]

A heads up that this absolute import is causing my downstream CI checks to fail on the upgrade PR for the latest version of nodejs-polars because typescript transpilation is failing:

Cannot find module '@polars/series' or its corresponding type declarations.

I can probably tweak my tsconfig to work around this, but thought it was worth flagging since it's inconsistent with the rest of the imports. Maybe something you want to codify for the project.

[sezanzeb]

I'll look into it on monday

[sezanzeb]

#76