Feature Request: Add support for hashing entire rows

[DeflateAwning]

It would be nice if there was support for the style shown in the regular Polars .hash() docs which looks like this:

df = pl.DataFrame(
    {
        "a": [1, 2, None],
        "b": ["x", None, "z"],
    }
)
df.with_columns(pl.all().hash(10, 20, 30, 40))

That is, it would be nice if there was a polars_hash.all(), so that you can do polars_hash.all().nchash.wyhash()) (or similar).

[ion-elgreco]

This is possible if you combine all values first

df = pl.DataFrame({
    "foo":["hello_world"],
    "bar": ["today"]
})

result = df.select(plh.concat_str(pl.all()).chash.sha256())

[DeflateAwning]

Any advice for finding a way to hash the values in test_hash_all_cols_with_list_and_struct()?

The best I've come up with so far is dumping/serializing with orjson (then hashing), but it's quite slow.

# Works great! Nice. Thanks.
def test_hash_all_cols_with_int_and_float() -> None:
    # Related to: https://github.com/ion-elgreco/polars-hash/issues/43
    df = pl.DataFrame({"foo": ["hello_world"], "bar": ["today"], "baz": [42], "qux": [3.14]})

    result = df.select(polars_hash.concat_str(pl.all()).chash.sha2_256())
    assert result.item() == "02f4d5e18d7369e25f97f5528872ea40dbeaa044c9a73704a293727742de90bb"

# This type of test (observe list/struct cols) does not work.
def test_hash_all_cols_with_list_and_struct() -> None:
    # Related to: https://github.com/ion-elgreco/polars-hash/issues/43.
    # Hopefully there will one day be a solution to this.
    df = pl.DataFrame(
        {
            "foo": ["hello_world"],
            "baz": [42],
            "qux": [[1, 2, 3]],
            "quux": [{"a": 1, "b": 2}],
        }
    )

    result = df.select(polars_hash.concat_str(pl.all()).chash.sha2_256())
    assert result.item() == "TODO: Fill this value once it doesn't error."

[ion-elgreco]

@DeflateAwning try this:

import polars as pl
import polars.selectors as cs
import polars_hash

# This type of test (observe list/struct cols) does not work.
def test_hash_all_cols_with_list_and_struct() -> None:
    # Related to: https://github.com/ion-elgreco/polars-hash/issues/43.
    # Hopefully there will one day be a solution to this.
    df = pl.DataFrame(
        {
            "foo": ["hello_world"],
            "baz": [42],
            "qux": [[1, 2, 3]],
            "quux": [{"a": 1, "b": 2}],
        }
    )

    result = df.select(
        polars_hash.concat_str(
            cs.all() - cs.list(),
            cs.list().list.eval(pl.element().cast(pl.Utf8)).list.join(","),
        ).chash.sha2_256()
    )
    assert (
        result.item()
        == "623b92447385e960eaddc0c1a2d4bf1eb4978f6d29277775e83c8e271b4d4dd9"
    )