From 0f3b60e95abeb9ab7163729eef368924d3ff15af Mon Sep 17 00:00:00 2001
From: GW <gregory.woods@neo4j.com>
Date: Wed, 6 May 2026 15:31:04 +0100
Subject: [PATCH] Ensure deep array quality for underlying vector array

---
 .../driver/internal/AbstractArrayVector.java  | 17 +++++-
 .../driver/internal/InternalVectorTest.java   | 52 +++++++++++++++++++
 2 files changed, 67 insertions(+), 2 deletions(-)
 create mode 100644 driver/src/test/java/org/neo4j/driver/internal/InternalVectorTest.java

diff --git a/driver/src/main/java/org/neo4j/driver/internal/AbstractArrayVector.java b/driver/src/main/java/org/neo4j/driver/internal/AbstractArrayVector.java
index 4be4eec9f..ff66561a1 100644
--- a/driver/src/main/java/org/neo4j/driver/internal/AbstractArrayVector.java
+++ b/driver/src/main/java/org/neo4j/driver/internal/AbstractArrayVector.java
@@ -17,6 +17,7 @@
 package org.neo4j.driver.internal;
 
 import java.lang.reflect.Array;
+import java.util.Arrays;
 import java.util.Objects;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -61,12 +62,12 @@ public boolean equals(Object o) {
         var that = (AbstractArrayVector<?>) o;
         return length == that.length
                 && Objects.equals(elementType, that.elementType)
-                && Objects.equals(elements, that.elements);
+                && Objects.deepEquals(elements, that.elements);
     }
 
     @Override
     public int hashCode() {
-        return Objects.hash(elementType, length, elements);
+        return Objects.hash(elementType, length, arrayHashCode(elements));
     }
 
     @Override
@@ -81,4 +82,16 @@ private T arraycopy(T elements) {
         System.arraycopy(elements, 0, result, 0, length);
         return result;
     }
+
+    private static int arrayHashCode(Object array) {
+        if (array instanceof byte[] value) return Arrays.hashCode(value);
+        if (array instanceof short[] value) return Arrays.hashCode(value);
+        if (array instanceof int[] value) return Arrays.hashCode(value);
+        if (array instanceof long[] value) return Arrays.hashCode(value);
+        if (array instanceof float[] value) return Arrays.hashCode(value);
+        if (array instanceof double[] value) return Arrays.hashCode(value);
+        if (array instanceof char[] value) return Arrays.hashCode(value);
+        if (array instanceof boolean[] value) return Arrays.hashCode(value);
+        return Arrays.deepHashCode((Object[]) array);
+    }
 }
diff --git a/driver/src/test/java/org/neo4j/driver/internal/InternalVectorTest.java b/driver/src/test/java/org/neo4j/driver/internal/InternalVectorTest.java
new file mode 100644
index 000000000..32dcac2a7
--- /dev/null
+++ b/driver/src/test/java/org/neo4j/driver/internal/InternalVectorTest.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) "Neo4j"
+ * Neo4j Sweden AB [https://neo4j.com]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.neo4j.driver.internal;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class InternalVectorTest {
+
+    @ParameterizedTest
+    @MethodSource("vectors")
+    void shouldRespectEqualityAndHashCode(AbstractArrayVector<?> vector1, AbstractArrayVector<?> vector2) {
+        assertEquals(vector1, vector2);
+        assertEquals(vector1.hashCode(), vector2.hashCode());
+    }
+
+    private static Stream<Arguments> vectors() {
+        return Stream.of(
+                Arguments.of(new InternalInt8Vector(new byte[] {1, 2, 3}), new InternalInt8Vector(new byte[] {1, 2, 3})),
+                Arguments.of(
+                        new InternalInt16Vector(new short[] {1, 2, 3}),
+                        new InternalInt16Vector(new short[] {1, 2, 3})),
+                Arguments.of(new InternalInt32Vector(new int[] {1, 2, 3}), new InternalInt32Vector(new int[] {1, 2, 3})),
+                Arguments.of(
+                        new InternalInt64Vector(new long[] {1L, 2L, 3L}),
+                        new InternalInt64Vector(new long[] {1L, 2L, 3L})),
+                Arguments.of(
+                        new InternalFloat32Vector(new float[] {1.1F, 2.2F, 3.3F}),
+                        new InternalFloat32Vector(new float[] {1.1F, 2.2F, 3.3F})),
+                Arguments.of(
+                        new InternalFloat64Vector(new double[] {1.1D, 2.2D, 3.3D}),
+                        new InternalFloat64Vector(new double[] {1.1D, 2.2D, 3.3D})));
+    }
+}
\ No newline at end of file