Allow scalar doubles

Author: IoannisPanagiotas

algo/src/test/java/org/neo4j/gds/kmeans/KmeansStreamConfigTest.java

@@ -72,7 +72,7 @@ void shouldFailOnInvalidPropertyValueTypes(ValueType valueType) {
         assertThatIllegalArgumentException()
             .isThrownBy(() -> streamConfig.graphStoreValidation(graphStoreMock, List.of(), List.of()))
             .withMessageContaining("Unsupported node property value type")
-            .withMessageContaining("Value type required: [DOUBLE_ARRAY] or [FLOAT_ARRAY].");
+            .withMessageContaining("Value type required: [DOUBLE], [DOUBLE_ARRAY] or [FLOAT_ARRAY].");
     }
 
     @ParameterizedTest
@@ -93,13 +93,14 @@ void shouldAcceptValidPropertyValueTypes(ValueType valueType) {
     static Stream<Arguments> validNodePropertyValueTypes() {
         return Stream.of(
             Arguments.of(ValueType.DOUBLE_ARRAY),
-            Arguments.of(ValueType.FLOAT_ARRAY)
+            Arguments.of(ValueType.FLOAT_ARRAY),
+            Arguments.of(ValueType.DOUBLE)
         );
     }
 
     static Stream<Arguments> invalidNodePropertyValueTypes() {
         return Arrays.stream(ValueType.values())
-            .filter(t -> t != ValueType.DOUBLE_ARRAY && t != ValueType.FLOAT_ARRAY)
+            .filter(t -> t != ValueType.DOUBLE_ARRAY && t != ValueType.FLOAT_ARRAY && t != ValueType.DOUBLE)
             .map(Arguments::of);
     }
 

procedures/facade-api/configs/community-configs/src/main/java/org/neo4j/gds/kmeans/KmeansBaseConfig.java

@@ -69,13 +69,14 @@ default void nodePropertyTypeValidation(
         Collection<RelationshipType> selectedRelationshipTypes
     ) {
         var valueType = graphStore.nodeProperty(nodeProperty()).valueType();
-        if (valueType == ValueType.DOUBLE_ARRAY || valueType == ValueType.FLOAT_ARRAY) {
+        if (valueType == ValueType.DOUBLE_ARRAY || valueType == ValueType.FLOAT_ARRAY || valueType == ValueType.DOUBLE) {
             return;
         }
         throw new IllegalArgumentException(
             StringFormatting.formatWithLocale(
-                "Unsupported node property value type [%s]. Value type required: [%s] or [%s].",
+                "Unsupported node property value type [%s]. Value type required: [%s], [%s] or [%s].",
                 valueType,
+                ValueType.DOUBLE,
                 ValueType.DOUBLE_ARRAY,
                 ValueType.FLOAT_ARRAY
             )