Fixes #3244 : label filtering in Cypher MATCH relationship patterns by ExtReMLapin · Pull Request #3252 · ArcadeData/arcadedb

ExtReMLapin · 2026-01-27T08:44:36Z

What does this PR do?

This PR fixes a critical bug in Cypher query execution where target node labels in relationship patterns were not being filtered, and bound variables with repeated labels in subsequent MATCH clauses were not being properly recognized. This caused:

Incorrect result sets: Queries like (chunk:CHUNK)<-[r:in]-(target:NER) would return vertices of all types connected via the "in" edge, not just NER vertices
Cartesian products: Repeating labels on already-bound variables (e.g., searchedChunk:CHUNK in multiple clauses) was not recognized as referring to the same bound variable, causing unnecessary cross-joins
Query failures: Some valid query patterns would return null or incorrect results

Motivation

This fix addresses a user-reported issue where complex Cypher queries with multiple OPTIONAL MATCH clauses and repeated labels on bound variables were returning incorrect data. The root causes were:

MatchRelationshipStep was not filtering target vertices by their labels
The bound variable tracking across MATCH clauses didn't account for variables with labels
The heuristic for detecting already-bound variables (checking for no labels/properties) was too simplistic

Related issues

This fixes the issue reported in the user's query pattern where searchedChunks was incorrectly containing NER nodes instead of only CHUNK nodes.

Changes Made

CypherExecutionPlan.java

Added boundVariables tracking across MATCH clauses to detect already-bound variables
Modified buildMatchStep() to skip creating new MatchNodeStep for variables already bound in previous MATCH clauses
Updated source node binding detection to check both the new boundVariables set and the old heuristic
Modified MatchRelationshipStep instantiation to pass target node pattern and bound variables for filtering
Applied same fixes to the legacy execution path

MatchRelationshipStep.java

Added targetNodePattern and boundVariableNames fields to support label filtering and bound variable checking
Implemented matchesTargetLabel() method to filter target vertices by their labels
Added identity check for already-bound target variables to prevent incorrect matches
Created backward-compatible constructor overload

CypherLabelFilteringTest.java (new)

Comprehensive test suite covering:
- Target node label filtering in relationship patterns
- Bound variables with labels in subsequent MATCH clauses
- Full query pattern from the bug report
- Verification that searchedChunks doesn't contain NER nodes

Issue3218Test.java

Updated existing tests to use labels on bound variables (now supported)
Removed workaround comments about the label filtering bug

Additional Notes

The changes are backward compatible - the new MatchRelationshipStep constructor has an overload that maintains the old behavior
Both the modern and legacy execution paths have been updated to ensure consistent behavior
The fix properly handles OPTIONAL MATCH clauses with label constraints on bound variables

Checklist

I have run the build using mvn clean package command
My unit tests cover both failure and success scenarios

https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP

Two bugs caused incorrect results in multi-MATCH/OPTIONAL MATCH Cypher queries: 1. MatchRelationshipStep never filtered target vertices by label. A pattern like (a:CHUNK)<-[r:in]-(b:NER) would return ANY connected vertex as b, not just NER vertices. Fixed by passing the target NodePattern and checking vertex type against label constraints. 2. Already-bound variables with labels were treated as unbound. The sourceAlreadyBound check required !sourceNode.hasLabels(), so writing (searchedChunk:CHUNK) in a subsequent MATCH created a full type scan instead of using the already-bound value. Fixed by tracking bound variable names across MATCH clauses. Also adds identity checking: when a target variable is already bound from a previous step, the traversed vertex must match the bound vertex identity. https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP

AssertJ's assertThat() has ambiguous overloads for Object return types from getProperty(). Switched to JUnit assertEquals/assertTrue/assertFalse. https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP

mergify · 2026-01-27T08:45:45Z

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ExtReMLapin · 2026-01-27T08:45:45Z

Claude code did what gemini could not do.

Claude code wrote all of this.

robfrank · 2026-01-27T11:11:30Z

@claude review this pr

claude · 2026-01-27T11:11:45Z

Claude encountered an error —— View job

Command failed: git fetch origin --depth=20 claude/fix-arcadedb-cypher-8z1Ym

I'll analyze this and get back to you.

lvca · 2026-01-27T15:27:20Z

@claude please check this again

claude · 2026-01-27T15:27:39Z

Claude encountered an error —— View job

Command failed: git fetch origin --depth=20 claude/fix-arcadedb-cypher-8z1Ym

I'll analyze this and get back to you.

ExtReMLapin · 2026-01-27T15:33:58Z

Claude encountered an error —— View job
Command failed: git fetch origin --depth=20 claude/fix-arcadedb-cypher-8z1Ym
I'll analyze this and get back to you.

@claude time to reconsider your career choices

lvca · 2026-01-27T15:38:42Z

@ExtReMLapin could you please rebase from main? Maybe claude is confused because it's too far apart?

ExtReMLapin · 2026-01-27T15:43:50Z

Claude is confused because it's not a branch on your repo but on mine.

lvca · 2026-01-27T15:47:03Z

@claude please review this PR

claude · 2026-01-27T15:47:22Z

Claude encountered an error —— View job

Command failed: git fetch origin --depth=20 claude/fix-arcadedb-cypher-8z1Ym

I'll analyze this and get back to you.

lvca · 2026-01-27T15:52:57Z

I'm checking it manually - old fashion.

lvca · 2026-01-27T16:07:04Z

Merged thanks!

…3252) * fix: Cypher target node label filtering and bound variable tracking Two bugs caused incorrect results in multi-MATCH/OPTIONAL MATCH Cypher queries: 1. MatchRelationshipStep never filtered target vertices by label. A pattern like (a:CHUNK)<-[r:in]-(b:NER) would return ANY connected vertex as b, not just NER vertices. Fixed by passing the target NodePattern and checking vertex type against label constraints. 2. Already-bound variables with labels were treated as unbound. The sourceAlreadyBound check required !sourceNode.hasLabels(), so writing (searchedChunk:CHUNK) in a subsequent MATCH created a full type scan instead of using the already-bound value. Fixed by tracking bound variable names across MATCH clauses. Also adds identity checking: when a target variable is already bound from a previous step, the traversed vertex must match the bound vertex identity. https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP * fix: use JUnit assertions instead of AssertJ to avoid ambiguous overload AssertJ's assertThat() has ambiguous overloads for Object return types from getProperty(). Switched to JUnit assertEquals/assertTrue/assertFalse. https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP --------- Co-authored-by: Claude <noreply@anthropic.com> (cherry picked from commit def0349)

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…from 3.5.4 to 3.5.5 [skip ci] Bumps [org.apache.maven.plugins:maven-surefire-plugin](https://github.com/apache/maven-surefire) from 3.5.4 to 3.5.5. 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claude added 2 commits January 27, 2026 08:15

fix: use JUnit assertions instead of AssertJ to avoid ambiguous overload

5f468a9

AssertJ's assertThat() has ambiguous overloads for Object return types from getProperty(). Switched to JUnit assertEquals/assertTrue/assertFalse. https://claude.ai/code/session_017hhsQf7fzBvXcGSeg48hfP

ExtReMLapin changed the title ~~Fix label filtering in Cypher MATCH relationship patterns~~ Fixex #3244 : label filtering in Cypher MATCH relationship patterns Jan 27, 2026

ExtReMLapin changed the title ~~Fixex #3244 : label filtering in Cypher MATCH relationship patterns~~ Fixes #3244 : label filtering in Cypher MATCH relationship patterns Jan 27, 2026

ExtReMLapin mentioned this pull request Jan 27, 2026

Altered behavior with cypher result on new engine #3244

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Merge branch 'ArcadeData:main' into claude/fix-arcadedb-cypher-8z1Ym

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lvca assigned ExtReMLapin Jan 27, 2026

lvca self-requested a review January 27, 2026 16:06

lvca added this to the 26.2.1 milestone Jan 27, 2026

lvca approved these changes Jan 27, 2026

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lvca merged commit def0349 into ArcadeData:main Jan 27, 2026
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ExtReMLapin commented Jan 27, 2026

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CypherExecutionPlan.java

MatchRelationshipStep.java

CypherLabelFilteringTest.java (new)

Issue3218Test.java

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