Before implementing ternary logic handling for null comparisons (= null, != null), we need to define the intended semantic model - whether the MongoDB Hibernate integration should follow three-valued logic (3VL), as Hibernate 6.3 does, or two-valued logic (2VL), which may simplify behavior and better align with MongoDB’s handling of missing and null fields.

Context:

• Hibernate 6.3+ interprets null comparisons as returning null (per 3VL), treated as false in predicate contexts.
• MongoDB compares missing and null values equally, effectively operating as 2VL.
• Implementation work for null comparison behavior is tracked in HIBERNATE-74.
• Related tickets:
  • HIBERNATE-62 - handling non-null fields
  • HIBERNATE-71 - handling is null and is not null predicates

Acceptance criteria:

• Evaluate pros and cons of adopting 3VL (consistency with Hibernate) vs. 2VL (consistency with MongoDB semantics)
• Document the chosen model and rationale.
• Provide implementation guidance for HIBERNATE-74 based on the decision