fix: select constant return empty value

[Matagits]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Fix the problem that when select constant data and then it will generate dataframe with one colume but not data, and add corresponding test code. And when sql expression contains cast expression to select constant in offline mode, it will throw exception.

• What is the current behavior? (You can also link to an open issue here)
  Issue#3733. Select constant data will not return value row #3733
  Plus, when sql expression contains cast expression to select constant in offline mode, it will throw exception.

• What is the new behavior (if this is a feature change)?
  When select constant data, it will generate dataframe with one row of corresponding constant data. And also support cast expression when select constant in offline mode.

[github-actions]

SDK Test Report

101 files  101 suites   2m 6s ⏱️
349 tests 335 ✅ 14 💤 0 ❌
475 runs  461 ✅ 14 💤 0 ❌

Results for commit 260a0d3.

♻️ This comment has been updated with latest results.

[github-actions]

Linux Test Report

    56 files     189 suites   1h 22m 48s ⏱️
12 619 tests 12 611 ✅ 7 💤 1 ❌
12 620 runs  12 612 ✅ 7 💤 1 ❌

For more details on these failures, see this check.

Results for commit 260a0d3.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 74.89%. Comparing base (6e45bec) to head (260a0d3).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...radigm/openmldb/batch/nodes/ConstProjectPlan.scala	78.94%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3825       +/-   ##
=============================================
+ Coverage     40.69%   74.89%   +34.20%     
  Complexity      658      658               
=============================================
  Files           195      742      +547     
  Lines         11650   133786   +122136     
  Branches       1384     1379        -5     
=============================================
+ Hits           4741   100203    +95462     
- Misses         6605    33279    +26674     
  Partials        304      304               

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[tobegit3hub]

LGTM

[tobegit3hub]

Please resolve the cicd issue in https://github.com/4paradigm/OpenMLDB/actions/runs/8419907957/job/23053523375?pr=3825 .