Changes to unmapped fields in metric aggregation factory

[expani]

Description

Handling empty field context for fields absent in the index.

Related Issues

Resolves #16473

[github-actions]

❌ Gradle check result for 1f8dcc6: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[sandeshkr419]

@expani Thanks for debugging this. Can you please add a unit test case and move this out of draft state.

[github-actions]

✅ Gradle check result for 51eb573: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 72.13%. Comparing base (10873f1) to head (51eb573).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...x/datacube/startree/utils/StarTreeQueryHelper.java	0.00%	0 Missing and 1 partial ⚠️
...gations/support/ValuesSourceAggregatorFactory.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16481      +/-   ##
============================================
- Coverage     72.15%   72.13%   -0.02%     
- Complexity    65145    65172      +27     
============================================
  Files          5315     5318       +3     
  Lines        303573   303781     +208     
  Branches      43925    43951      +26     
============================================
+ Hits         219039   219136      +97     
- Misses        66587    66747     +160     
+ Partials      17947    17898      -49     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.