[Draft] Optimise Unnest CTE Queries

[suddendust]

This is a draft PR.

[codecov]

Codecov Report

❌ Patch coverage is 75.38462% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.57%. Comparing base (f25bebd) to head (ef0844f).

Files with missing lines	Patch %	Lines
.../v1/vistors/PostgresFromTypeExpressionVisitor.java	75.38%	8 Missing and 8 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #310      +/-   ##
============================================
- Coverage     81.63%   81.57%   -0.07%     
- Complexity     1549     1572      +23     
============================================
  Files           242      242              
  Lines          7450     7510      +60     
  Branches        720      735      +15     
============================================
+ Hits           6082     6126      +44     
- Misses          916      924       +8     
- Partials        452      460       +8     

Flag	Coverage Δ
integration	81.57% <75.38%> (-0.07%)	⬇️
unit	56.36% <67.69%> (+0.37%)	⬆️

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[github-actions]

Test Results

  125 files  +1    125 suites  +1   37s ⏱️ ±0s
  841 tests +3    840 ✅ +3  1 💤 ±0  0 ❌ ±0 
1 177 runs  +3  1 176 ✅ +3  1 💤 ±0  0 ❌ ±0 

Results for commit ef0844f. ± Comparison against base commit f25bebd.