Handle nested null arrays correctly

[suddendust]

Fix Postgres cannot extract elements from a scalar error for JSON null arrays

What was breaking?

jsonb_array_elements() throws PSQLException: cannot extract elements from a scalar when encountering JSON null values in JSONB array fields. This affected both UnnestExpression queries and ArrayRelationalFilterExpression.ANY filters.

How was the bug reproduced?

Added test data with props.colors: null (JSON null, not SQL NULL) and ran queries that unnest or filter on that field.

What was the fix applied?

Replaced direct jsonb_array_elements(field) calls with:

jsonb_array_elements(CASE WHEN jsonb_typeof(field) = 'array' THEN field ELSE '[]'::jsonb END)

Testing

[X] Added integration tests

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 58.02%. Comparing base (e434dfa) to head (d29c4e4).

Files with missing lines	Patch %	Lines
.../v1/vistors/PostgresFromTypeExpressionVisitor.java	66.66%	0 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (e434dfa) and HEAD (d29c4e4). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e434dfa)	HEAD (d29c4e4)
integration	1	0

Additional details and impacted files

@@              Coverage Diff              @@
##               main     #265       +/-   ##
=============================================
- Coverage     80.26%   58.02%   -22.24%     
  Complexity     1337     1337               
=============================================
  Files           231      231               
  Lines          6080     6082        +2     
  Branches        545      546        +1     
=============================================
- Hits           4880     3529     -1351     
- Misses          826     2217     +1391     
+ Partials        374      336       -38     

Flag	Coverage Δ
integration	?
unit	58.02% <66.66%> (-0.01%)	⬇️

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