Fix the testtimestamp_add_interval_months

[HaoYang670]

Signed-off-by: remzi 13716567376yh@gmail.com

Which issue does this PR close?

Closes #3321 .

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

[andygrove]

LGTM. Thanks @HaoYang670

[codecov-commenter]

Codecov Report

Merging #3337 (92e3c57) into master (dadd2dc) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3337   +/-   ##
=======================================
  Coverage   85.83%   85.84%           
=======================================
  Files         294      294           
  Lines       53752    53767   +15     
=======================================
+ Hits        46137    46154   +17     
+ Misses       7615     7613    -2     

Impacted Files	Coverage Δ
datafusion/core/tests/sql/timestamp.rs	99.66% <100.00%> (+<0.01%)	⬆️
datafusion/expr/src/logical_plan/plan.rs	78.39% <0.00%> (+0.16%)	⬆️
datafusion/core/src/physical_plan/metrics/value.rs	87.43% <0.00%> (+0.50%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[ursabot]

Benchmark runs are scheduled for baseline = a5d6ae4 and contender = 8b2fd22. 8b2fd22 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

[alamb]

Thank you @HaoYang670