CREATE VIEW should return empty dataframe

[kmitchener]

Which issue does this PR close?

Closes #3236 .

Rationale for this change

Per issue -- create view should just create the view.

What changes are included in this PR?

Are there any user-facing changes?

yes, CREATE VIEW will no longer return the results of the given SQL. It will return an empty dataframe upon success.

[andygrove]

Could you add a test?

[codecov-commenter]

Codecov Report

Merging #3237 (ac7c957) into master (74872a3) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3237      +/-   ##
==========================================
+ Coverage   85.81%   85.83%   +0.01%     
==========================================
  Files         292      293       +1     
  Lines       53117    53170      +53     
==========================================
+ Hits        45585    45638      +53     
  Misses       7532     7532              

Impacted Files	Coverage Δ
datafusion/core/src/execution/context.rs	78.26% <100.00%> (+0.05%)	⬆️
datafusion/optimizer/tests/integration-test.rs	84.00% <0.00%> (ø)
datafusion/expr/src/logical_plan/plan.rs	78.55% <0.00%> (+0.55%)	⬆️
datafusion/expr/src/window_frame.rs	93.27% <0.00%> (+0.84%)	⬆️
datafusion/expr/src/utils.rs	91.10% <0.00%> (+1.07%)	⬆️

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[kmitchener]

Could you add a test?

Added

[ursabot]

Benchmark runs are scheduled for baseline = c574269 and contender = aa6a34b. aa6a34b 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