Optimize iszero function (3-5x faster)

[simonvandel]

Which issue does this PR close?

Didn't create an issue beforehand.

Rationale for this change

iszero runs faster using BooleanArray::from_unary.

I think this is because we don't need to branch on each value to check if it's null, which the .iter inside make_function_scalar_inputs_return_type is doing.

What changes are included in this PR?

• Add benchmark
• Replace make_function_scalar_inputs_return_type use with BooleanArray::from_unary

Are these changes tested?

Yes, with existing tests.

Are there any user-facing changes?

Faster iszero. I don't expect this function to be a bottleneck anywhere, but at least it's a bit faster now.

iszero f32 array: 1024  time:   [771.48 ns 773.07 ns 774.97 ns]
                        change: [-69.960% -69.618% -69.232%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 16 outliers among 100 measurements (16.00%)
  6 (6.00%) high mild
  10 (10.00%) high severe

iszero f64 array: 1024  time:   [683.35 ns 683.91 ns 684.49 ns]
                        change: [-71.834% -71.698% -71.596%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
  2 (2.00%) high mild
  4 (4.00%) high severe

iszero f32 array: 4096  time:   [2.6036 µs 2.6096 µs 2.6169 µs]
                        change: [-76.842% -76.730% -76.618%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
  1 (1.00%) low mild
  1 (1.00%) high mild
  4 (4.00%) high severe

iszero f64 array: 4096  time:   [2.2268 µs 2.2291 µs 2.2316 µs]
                        change: [-80.502% -80.449% -80.397%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 8 outliers among 100 measurements (8.00%)
  5 (5.00%) high mild
  3 (3.00%) high severe

iszero f32 array: 8192  time:   [5.0282 µs 5.0438 µs 5.0620 µs]
                        change: [-79.426% -79.363% -79.282%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
  1 (1.00%) low mild
  4 (4.00%) high mild
  6 (6.00%) high severe

iszero f64 array: 8192  time:   [4.2459 µs 4.2543 µs 4.2643 µs]
                        change: [-82.480% -82.445% -82.411%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
  1 (1.00%) high mild
  1 (1.00%) high severe

[jonahgao]

LGTM👍

[2010YOUY01]

👍🏼
This should be applicable to many places as long as the lambda arg in from_unary() can't fail