[Bugfix] PostgreSQL case sensitivity bug in UNNEST alias for flat collections

[suddendust]

Description

When using UNNEST on flat collections with mixed-case field names (e.g., categoryTags), PostgreSQL threw an error: column "attributes_dot_authTypes_unnested" does not exist Hint: Perhaps you meant to reference the column "attributes_dot_authtypes_unnested".

Root Cause

The UNNEST alias was created without quotes, causing PostgreSQL to lowercase it (categorytags_unnested), but references used quotes preserving the original case ("categoryTags_unnested"), resulting in a mismatch.

Solution

Both aliases are now generated as: p1("categoryTags_unnested") instead of p1(categoryTags_unnested), eliminating the mismatch

Testing

• Added integration test testFlatPostgresCollectionUnnestMixedCaseField with categoryTags field.
• Test reproduces the bug without the fix and passes with the fix.
• Existing lowercase field tests continue to pass (case insensitivity unaffected).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.88%. Comparing base (5c65ef6) to head (165bf93).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #242      +/-   ##
============================================
+ Coverage     79.87%   79.88%   +0.01%     
- Complexity     1099     1100       +1     
============================================
  Files           213      213              
  Lines          5396     5400       +4     
  Branches        473      473              
============================================
+ Hits           4310     4314       +4     
  Misses          760      760              
  Partials        326      326              

Flag	Coverage Δ
integration	79.88% <100.00%> (+0.01%)	⬆️
unit	56.88% <60.00%> (-0.01%)	⬇️

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