sqllogicaltest: move union.rs

[jackwener]

Which issue does this PR close?

move union.rs into sqllogicaltest.

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[jackwener]

@melgenek thanks your review❤️.
Have resolved them

[alamb]

Thanks @jackwener and @melgenek for the review!

[ursabot]

Benchmark runs are scheduled for baseline = fbff8e2 and contender = dd09212. dd09212 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

[ozankabak]

We seem to be getting CI errors on master, a superficial look suggest it may be related to this.

[jackwener]

We seem to be getting CI errors on master, a superficial look suggest it may be related to this.

Is there a related PR?

[jackwener]

I have reproduced this Problem, I will fix it. Thank you @ozankabak