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Description
Work in progress: initial implementation of MERGE support in sqlite-graph. Adds preliminary handling for node and single-hop relationship patterns, aligned with openCypher semantics.
Related Issues
Closes #184
Type of Change
• ✨ New feature (non-breaking change that adds functionality)
• ✅ Test improvement
Changes Made
• Introduced base MERGE operation structure.
• Added parser hooks and placeholder executor logic.
• Included early tests for node and relationship MERGE patterns.
Testing
• All existing tests pass (make test)
• Added minimal tests for MERGE parsing
Test Evidence
Documentation
• Added TODO notes in README for future MERGE syntax examples.
Checklist
• Code builds and runs cleanly under ASAN/UBSAN.
• No new warnings introduced.
Breaking Changes
N/A
Performance Impact
• No measurable impact (early-stage work)
Additional Context
This is a foundation PR for full MERGE feature support. Next steps include integrating ON CREATE / ON MATCH logic and symmetric relationship matching.
Reviewer Notes
Focus on structure and placement of the MERGE integration points; behavior is stubbed for now.