Minor: Do what clippy says and clean up some code

[alamb]

Which issue does this PR close?

N/A

Rationale for this change

clippy says it is infallible, which it is

So make it so and remove some ?

What changes are included in this PR?

Fix a clippy lint

Are there any user-facing changes?

No

[jackwener]

I can't find this ability of clippy in doc, Can I ask how to use it?

[alamb]

I can't find this ability of clippy in doc, Can I ask how to use it?

I am not sure what you mean

In this case I found that someone had left a "#allow" command in the code (which ignores something clippy would normally flag a a warning). I removed the "allow" and then updated the code so clippy passed.

[jackwener]

In this case I found that someone had left a "#allow" command in the code (which ignores something clippy would normally flag a a warning). I removed the "allow" and then updated the code so clippy passed.

😂

[ursabot]

Benchmark runs are scheduled for baseline = d6f0b12 and contender = f4d70ac. f4d70ac is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-datafusion-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java