Cypher : fix param in match

engine/src/main/java/com/arcadedb/query/opencypher/executor/steps/MatchNodeStep.java

@@ -509,7 +509,17 @@ private boolean matchesProperties(final Vertex vertex, final Result currentResul
         expectedValue = evaluator.evaluate((Expression) expectedValue, currentResult, context);
       }
 
-      // Resolve parameter references (e.g., $id -> actual value from context)
+      // Resolve ParameterReference objects (e.g., {user_name: $username} -> actual value from context)
+      if (expectedValue instanceof CypherASTBuilder.ParameterReference) {
+        final String paramName = ((CypherASTBuilder.ParameterReference) expectedValue).getName();
+        if (context.getInputParameters() != null) {
+          final Object paramValue = context.getInputParameters().get(paramName);
+          if (paramValue != null)
+            expectedValue = paramValue;
+        }
+      }
+
+      // Resolve parameter references stored as strings (legacy "$paramName" format)
       if (expectedValue instanceof String) {
         final String strValue = (String) expectedValue;
 

engine/src/test/java/com/arcadedb/query/opencypher/ParameterTest.java

@@ -203,6 +203,38 @@ void manyParametersInIdQuery() {
     }
   }
 
+  /**
+   * Regression test for: MATCH (n:LABEL {prop: $param}) returns nothing when using inline
+   * node-pattern property filters with parameters, while the equivalent literal query works.
+   * The parser stores the parameter as a ParameterReference object in the properties map,
+   * and MatchNodeStep.matchesProperties() was not resolving it before comparing.
+   */
+  @Test
+  void inlineNodePatternParameterMatching() {
+    final Database database = new DatabaseFactory("./target/testparams4").create();
+    try {
+      database.getSchema().getOrCreateVertexType("USER_RIGHTS");
+
+      database.transaction(() ->
+          database.command("opencypher", "CREATE (n:USER_RIGHTS {user_name: \"random_username_123\"}) RETURN n"));
+
+      // Inline property filter with a string parameter should return the node
+      final ResultSet result = database.query("opencypher",
+          "MATCH (n:USER_RIGHTS {user_name: $username}) RETURN n",
+          Map.of("username", "random_username_123"));
+
+      int count = 0;
+      while (result.hasNext()) {
+        result.next();
+        count++;
+      }
+      assertThat(count).isEqualTo(1);
+    } finally {
+      database.drop();
+      FileUtils.deleteRecursively(new File("./target/testparams4"));
+    }
+  }
+
   @BeforeEach
   @AfterEach
   void clean() {