feat(rust,python,cli): add SQL engine support for MOD function

[alexander-beedie]

Adds SQL support for MOD¹ as a function, in addition to the existing support for the modulo % operator.

Example

import polars as pl

df = pl.DataFrame({
    "a": [1.5, None, 3.0, 10.0, 5.0],
    "b": [6, 7, 8, 9, None],
})
with pl.SQLContext(df=df) as ctx:
    out = ctx.execute(
        """
        SELECT
          a % 2 AS a_mod_2,
          MOD(b,3) AS b_mod_3,
        FROM df
        """
    ).collect()

    # shape: (5, 2)
    # ┌─────────┬─────────┐
    # │ a_mod_2 ┆ b_mod_3 │
    # │ ---     ┆ ---     │
    # │ f64     ┆ i64     │
    # ╞═════════╪═════════╡
    # │ 1.5     ┆ 0       │
    # │ null    ┆ 1       │
    # │ 1.0     ┆ 2       │
    # │ 0.0     ┆ 0       │
    # │ 1.0     ┆ null    │
    # └─────────┴─────────┘

Footnotes

1. MOD function: https://www.postgresql.org/docs/current/functions-math.html#id-1.5.8.9.6.2.2.19.1.1.1 ↩

[stinodego]

The next polars-cli release is going to be juicy!

[alexander-beedie]

The next polars-cli release is going to be juicy!

And once #13491 goes in, I'm going to follow-up with looooong requested LIKE and ILIKE support too (already got it working locally). Make it a real party, heh 😎👍