Edge gets erroneously created on deleted node

[DominicWuest]

I found a discrepancy when running two semantically equivalent queries against an empty database:

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1:

CREATE (x) DELETE x
MERGE (x)-[:n0]->(x)
CREATE ()

Creates one relationship.

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2:

CREATE (x) DELETE x
MERGE (x)-[:n0]->(x)
CREATE (y) DELETE y
CREATE ()

Creates zero relationships.

---

I believe the queries mentioned above are semantically equivalent and thus their result should be the same.

Additionally, this result only occurs after the commit ****, before which both queries return the same result.

I encountered this issue when testing queries on the FalkorDB master branch in a Docker container running redis:7.2.3-bookworm.

Steps to reproduce

Run the aforementioned, semantically equivalent, queries against an empty database and observe that their results differ.

Expected behavior

The queries should result in the same behavior

Actual behavior

The query results differ