Sync EQ/NEQ on Arrays in Flat Collections with Mongo

[suddendust]

Fix Postgres Array EQ/NEQ Query Generation

Problem

EQ and NEQ operators on array fields in flat should behave similarly to Mongo:

1. Arrays EQ scalar: Containment check.
2. Arrays NEQ scalar: ! containment check.
3. Arrays EQ arrays: Exact match on arrays.
4. Arrays NEQ arrays: ! exact match on arrays.

Solution

1. Operator Conversion for Scalar Values

When EQ/NEQ is used on an array field with a scalar RHS, convert to CONTAINS/NOT_CONTAINS:

• tags EQ "hygiene" → tags @> ARRAY['hygiene']::text[]
• props.colors NEQ "Blue" → NOT (props->'colors' @> '["Blue"]'::jsonb)

2. Exact Equality for Array Values

When EQ/NEQ is used with an array RHS, use exact equality operators:

• tags EQ ["hygiene", "family-pack"] → tags = ARRAY['hygiene','family-pack']::text[]
• props.colors EQ ["Blue", "Green"] → props->'colors' = '["Blue","Green"]'::jsonb

Testing

[x] Added integration tests.
[] Test these changes in a live env.

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 81.57895% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.48%. Comparing base (df5c5f6) to head (5a32cec).

Files with missing lines	Patch %	Lines
...ter/PostgresRelationalFilterParserFactoryImpl.java	78.57%	2 Missing and 7 partials ⚠️
...der/PostgresSelectExpressionParserBuilderImpl.java	80.00%	1 Missing and 3 partials ⚠️
.../filter/PostgresJsonArrayEqualityFilterParser.java	73.33%	3 Missing and 1 partial ⚠️
...ter/PostgresTopLevelArrayEqualityFilterParser.java	83.33%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #257      +/-   ##
============================================
+ Coverage     80.44%   80.48%   +0.03%     
- Complexity     1256     1297      +41     
============================================
  Files           227      230       +3     
  Lines          5839     5948     +109     
  Branches        517      536      +19     
============================================
+ Hits           4697     4787      +90     
- Misses          789      797       +8     
- Partials        353      364      +11     

Flag	Coverage Δ
integration	80.48% <81.57%> (+0.03%)	⬆️
unit	57.96% <71.05%> (+0.28%)	⬆️

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