[seanjSO]

Description

• Fixes a bug where a MATCH expression followed by a shortest path harness call fails with a SQL error, due to the outer CTE context not being available when evaluating dynamic SQL. Resolve the roots coming from these MATCHes and pass to the array overload of the shortest path harness.
• Fixes a small correctness bug where ASP harness bails early after returning the matching front.
• Updates the Makefile to output the integration coverage metrics to a coverage file for merge w/ the unit coverage metrics.

Resolves: BED-9976

Type of Change

• Chore (a change that does not modify the application functionality)
• Bug fix (a change that fixes an issue)
• New feature / enhancement (a change that adds new functionality)
• Refactor (no behaviour change)
• Test coverage
• Build / CI / tooling
• Documentation

Testing

• Unit tests added / updated
• Integration tests added / updated
• Full test suite run (make test_all with CONNECTION_STRING set)

Screenshots (if appropriate):

Driver Impact

• PostgreSQL driver (drivers/pg)
• Neo4j driver (drivers/neo4j)

Checklist

• Code is formatted
• All existing tests pass
• go.mod / go.sum are up to date if dependencies changed

Summary by CodeRabbit

• New Features

  • Shortest-path queries now support additional AdminTo traversal patterns, including paths seeded by earlier matches and queries using WITH.
  • All-shortest-path queries can use roots selected by earlier matches or node-kind filters.
  • Shortest-path queries now support open-ended traversals from previously matched roots to multiple terminals, including in mutations.

• Bug Fixes

  • All-shortest-path queries now return every path at the nearest depth for each root, including when roots resolve at different depths.
  • Queries with ambiguous output columns return empty results, and self-endpoint cases report an error.

[coderabbitai]

No actionable comments were generated in the recent review.

Walkthrough

The change updates PostgreSQL shortest-path endpoint handling and adds tests and fixtures for shortest-path resolution. It also separates unit and integration coverage profiles in the Makefile.

Changes

Shortest-Path Traversal

Layer / File(s)	Summary
Endpoint seeding and traversal cypher/models/pgsql/translate/expansion.go, cypher/models/pgsql/translate/shortest_workspace_test.go	When exactly one endpoint is bound, translation supplies filter SQL for unbounded traversals or endpoint ID arrays for bounded traversals. Tests cover bounded query shapes in both optimizer modes.
Shortest-path resolution validation cypher/models/pgsql/test/translation_cases/shortest_paths.sql, integration/testdata/cases/shortest_paths_inline.json, integration/testdata/templates/all_shortest_path_pair_resolution.json, cypher/models/pgsql/test/validation_integration_test.go, drivers/pg/query/asp_harness_integration_test.go, drivers/pg/query/sql/schema_up.sql, integration/testdata/README.md	Fixtures and tests cover prior-MATCH endpoint sets, all-shortest-path pair resolution, harness overloads, repeated harness calls, ambiguity cases, and self-endpoint errors. The harness SQL comments describe returning shortest witnesses at the current depth before recording resolved pairs; the SQL statements are unchanged.

Coverage Profiles

Layer / File(s)	Summary
Coverage profile targets Makefile	Unit tests and metric commands use the unit coverage profile. Integration tests write coverage to a separate profile and include COVERPKG.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Suggested reviewers: zinic

Merge Risk: Minimal · up to 09f2e

This change fixes shortest-path queries that follow a MATCH by passing endpoint filters in a form the harness can evaluate. It also adds test coverage and splits the unit and integration coverage profiles. No actionable merge-blocking risk was found. A query with two MATCH clauses before shortestPath was raised in discussion and is being handled separately.

Security architecture risk: Low · up to 09f2e

The change preserves endpoint-pair handling and safely represents endpoint IDs when passing them into traversal functions. No introduced security issue was established in the inspected flow. Validation remains incomplete for interrupted execution and broader deployment exposure.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The affected exposure is execution of shortest-path queries with a preceding bound endpoint. These queries can now reach existing harness functionality instead of failing on unavailable CTE context. The inspected path reads graph data and mutates session-local traversal workspaces; deployment-specific tenant exposure and database-role privileges were not established.

Trust Boundaries and Controls

• observed — Endpoint values are cast to int8 arrays. For unbounded traversal, PostgreSQL format %L quotes those values into a fixed INSERT template whose destination comes from translator-controlled filter identifiers. The inspected new helper does not interpolate caller text as SQL syntax.

Resilience and Maintainability Implications

• observed — Workspace definitions persist within a database session, but invocation initialization truncates frontier, visited, result, resolved-root, and endpoint-filter rows. ASP also resets resolved endpoint pairs. The new integration test asserts identical complete results on repeated calls in one transaction. This supports repetition isolation; interruption and concurrency remain source-assessed rather than execution-validated.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title names the bug fix (MATCH-leading shortest path harness call failing) and the ticket. It matches the main change in the changeset, which resolves MATCH-bound roots for the array overload of t…
Description check		The description follows the repository template. It includes a summary of the three changes, the ticket reference (BED-9976), the type-of-change selections (bug fix, test coverage, build/CI), testing …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Title check

Explanation

The title names the bug fix (MATCH-leading shortest path harness call failing) and the ticket. It matches the main change in the changeset, which resolves MATCH-bound roots for the array overload of the ASP harness. The title omits the ASP early-exit fix and the Makefile coverage change, which is acceptable.

Full details: Description check

Explanation

The description follows the repository template. It includes a summary of the three changes, the ticket reference (BED-9976), the type-of-change selections (bug fix, test coverage, build/CI), testing checkboxes, and the driver impact (PostgreSQL). The Screenshots section is empty, which is acceptable for a non-visual change. The Neo4j driver box is unchecked, which is correct. The go.mod/go.sum checkbox is unchecked, and the description does not state whether dependencies changed, so the author should confirm that. The template comment placeholder under Testing was left in place, which is a minor issue.

Finishing Touches

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_{A rabbit checks the paths at dawn
Through Group and Computer, trails run on
Each shortest route is counted clear
Unit and integration logs appear
Then carrots mark the tests as done.}

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Commits

Reviewing files that changed from the base of the PR and between d479b42 and 09f2e12.

Files selected for processing: 8

• Makefile
• cypher/models/pgsql/test/translation_cases/shortest_paths.sql
• cypher/models/pgsql/translate/expansion.go
• cypher/models/pgsql/translate/shortest_workspace_test.go
• drivers/pg/query/asp_harness_integration_test.go
• drivers/pg/query/sql/schema_up.sql
• integration/testdata/README.md
• integration/testdata/templates/all_shortest_path_pair_resolution.json

Files skipped from review as they are similar to previous changes: 1

• drivers/pg/query/sql/schema_up.sql

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Actionable comments posted: 1

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Inline comments:
Review comments at @Makefile:
- Line 100: Update the test_integration target’s Go test invocation to pass the
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Reviewing files that changed from the base of the PR and between 2d3c62b and 2763055.

Files selected for processing: 6

• Makefile
• cypher/models/pgsql/test/translation_cases/shortest_paths.sql
• cypher/models/pgsql/test/validation_integration_test.go
• cypher/models/pgsql/translate/expansion.go
• drivers/pg/query/sql/schema_up.sql
• integration/testdata/cases/shortest_paths_inline.json

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[AD7ZJ]

I have been messing around with this to try and understand :) It seems like this does fix the issue!

This is probably for another ticket but if you do a query with two MATCHs ahead of the shortestpath() call, it still runs into a similar issue:

MATCH (c:Computer)
MATCH (u:User) 
MATCH p=shortestPath((c)-[*1..]->(u)) RETURN p LIMIT 500

[seanjSO]

@AD7ZJ i'll dig in to this a little bit today to see if it's much to fix here or if it should go into another ticket. thank you!!

[zinic]

Heads up - I rebased this based on the V2 changes that just moved into main. No significant snags noted.