Make timecol be case-insensitive in FORECAST TVF

[JackieTien97]

[sonarqubecloud[bot]]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.16667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 39.11%. Comparing base (5cb3881) to head (f7c00f5). Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...relational/function/tvf/ForecastTableFunction.java	69.23%	4 Missing :warning:
...ne/plan/relational/analyzer/StatementAnalyzer.java	85.71%	1 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #15812      +/-   ##
============================================
- Coverage     39.12%   39.11%   -0.02%     
  Complexity      198      198              
============================================
  Files          4837     4837              
  Lines        314717   314726       +9     
  Branches      39505    39509       +4     
============================================
- Hits         123139   123092      -47     
- Misses       191578   191634      +56     

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