update TPCH-mimicking tests to Decimal data type from Float, matching the benchmark

[kmitchener]

Which issue does this PR close?

Closes #3435.

Rationale for this change

TPC-H benchmarks were updated to use Decimal types, these tests should follow.

What changes are included in this PR?

In addition to change to Decimal type, I've ignored a test and entered an issue #3437 where it now fails.

Are there any user-facing changes?

No

[codecov-commenter]

Codecov Report

Merging #3438 (b463451) into master (8b59b20) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3438      +/-   ##
==========================================
- Coverage   85.64%   85.60%   -0.04%     
==========================================
  Files         296      297       +1     
  Lines       54464    54473       +9     
==========================================
- Hits        46643    46633      -10     
- Misses       7821     7840      +19     

Impacted Files	Coverage Δ
datafusion/core/tests/sql/explain_analyze.rs	83.87% <ø> (ø)
datafusion/core/tests/sql/predicates.rs	100.00% <ø> (ø)
datafusion/core/tests/sql/subqueries.rs	94.95% <ø> (+0.71%)	⬆️
datafusion/core/tests/sql/mod.rs	97.78% <100.00%> (+0.01%)	⬆️
datafusion/proto/src/to_proto.rs	52.00% <0.00%> (-0.54%)	⬇️
datafusion/expr/src/logical_plan/plan.rs	77.02% <0.00%> (-0.34%)	⬇️
datafusion/sql/src/planner.rs	80.92% <0.00%> (-0.15%)	⬇️
datafusion/physical-expr/src/aggregate/count.rs	98.05% <0.00%> (ø)
datafusion/physical-expr/src/aggregate/average.rs	94.96% <0.00%> (ø)
...tafusion/physical-expr/src/aggregate/covariance.rs	98.70% <0.00%> (ø)
... and 5 more

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[andygrove]

Thanks @kmitchener

[alamb]

Thanks again @kmitchener

[ursabot]

Benchmark runs are scheduled for baseline = 904b757 and contender = a8c1579. a8c1579 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