https://blog.ladybugdb.com/post/better-graph-database-ball/
LadybugDB uses a variant of strongly typed Cypher. DuckDB and Postgres implement PGQ, which is a read-only graph query language. They maintain their SQL optimized storage as-is and compute some in-memory data structures on the fly.
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https://blog.ladybugdb.com/post/better-graph-database-ball/