fix: add udf for string to timestamp and ut

[tobegit3hub]

• Resolve Select timestamp(string_val) will get null data #3012 .

[codecov]

Codecov Report

Base: 36.46% // Head: 75.71% // Increases project coverage by +39.25% 🎉

Coverage data is based on head (1c18f39) compared to base (f178654).
Patch coverage: 78.94% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #3088       +/-   ##
=============================================
+ Coverage     36.46%   75.71%   +39.25%     
  Complexity      393      393               
=============================================
  Files           160      666      +506     
  Lines          9624   124775   +115151     
  Branches       1132     1091       -41     
=============================================
+ Hits           3509    94477    +90968     
- Misses         5879    30062    +24183     
  Partials        236      236               

Impacted Files	Coverage Δ
...adigm/openmldb/batch/nodes/SimpleProjectPlan.scala	75.00% <50.00%> (+9.61%)	⬆️
...radigm/openmldb/batch/nodes/ConstProjectPlan.scala	10.34% <86.66%> (+8.82%)	⬆️
src/sdk/sql_router.cc	2.83% <0.00%> (ø)
hybridse/include/base/raw_buffer.h	12.50% <0.00%> (ø)
src/base/file_util.h	81.86% <0.00%> (ø)
hybridse/src/codegen/scope_var.cc	64.81% <0.00%> (ø)
hybridse/src/codegen/aggregate_ir_builder_test.cc	100.00% <0.00%> (ø)
src/base/proto_util.h	100.00% <0.00%> (ø)
hybridse/src/vm/jit_wrapper_test.cc	95.34% <0.00%> (ø)
...xamples/toydb/src/testing/toydb_engine_test_base.h	52.87% <0.00%> (ø)
... and 499 more

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[github-actions]

SDK Test Report

  88 files    88 suites   1m 32s ⏱️
182 tests 173 ✔️ 9 💤 0 ❌
228 runs  219 ✔️ 9 💤 0 ❌

Results for commit 1c18f39.

♻️ This comment has been updated with latest results.

[github-actions]

Linux Test Report

       56 files       230 suites   1h 16m 46s ⏱️
11 923 tests 11 916 ✔️ 7 💤 0 ❌
16 924 runs  16 917 ✔️ 7 💤 0 ❌

Results for commit 1c18f39.

♻️ This comment has been updated with latest results.