kie-issues#1466: A Decision Table with a single output column shouldn't have a name

packages/boxed-expression-component/src/expressions/DecisionTableExpression/DecisionTableExpression.tsx

@@ -76,7 +76,9 @@ enum DecisionTableColumnType {
   OutputClause = "output",
   Annotation = "annotation",
 }
-
+const singleOutputColumn = {
+  name: "Output-1",
+};
 export const DECISION_TABLE_INPUT_DEFAULT_VALUE = "-";
 export const DECISION_TABLE_OUTPUT_DEFAULT_VALUE = "";
 export const DECISION_TABLE_ANNOTATION_DEFAULT_VALUE = "";
@@ -352,8 +354,8 @@ export function DecisionTableExpression({
         id: outputClause["@_id"],
         label:
           decisionTableExpression.output?.length == 1
-            ? decisionTableExpression["@_label"] ?? DEFAULT_EXPRESSION_VARIABLE_NAME
-            : outputClause["@_name"] ?? outputClause["@_label"] ?? DEFAULT_EXPRESSION_VARIABLE_NAME,
+            ? ""
+            : outputClause["@_name"] ?? outputClause["@_label"] ?? singleOutputColumn.name,
         dataType:
           decisionTableExpression.output?.length == 1
             ? decisionTableExpression["@_typeRef"] ?? DmnBuiltInDataType.Undefined

packages/dmn-editor/src/boxedExpressions/getDefaultBoxedExpression.tsx

@@ -277,7 +277,15 @@ export function getDefaultBoxedExpression({
       "@_typeRef": typeRef,
       "@_hitPolicy": "UNIQUE",
       input,
-      output,
+      output: output.map((out) => {
+        if (output.length > 1) {
+          return {
+            ...out,
+          };
+        } else {
+          return { ...out, "@_name": undefined };
+        }
+      }),
       annotation: [
         {
           "@_name": "Annotations",

packages/dmn-editor/src/propertiesPanel/BoxedExpressionPropertiesPanelComponents/DecisionTableOutputHeaderCell.tsx

@@ -45,7 +45,9 @@ export function DecisionTableOutputHeaderCell(props: {
   const activeDrgElementId = useDmnEditorStore((s) => s.boxedExpressionEditor.activeDrgElementId);
   const { dmnEditorRootElementRef } = useDmnEditor();
   const { externalModelsByNamespace } = useExternalModels();
-
+  const singleOutputColumn = {
+    name: "Output-1",
+  };
   const node = useDmnEditorStore((s) =>
     s
       .computed(s)
@@ -172,18 +174,22 @@ export function DecisionTableOutputHeaderCell(props: {
           />
         </>
       )}
-      <NameField
-        alternativeFieldName={root?.output.length === 1 ? "Column Name" : undefined}
-        isReadOnly={props.isReadOnly}
-        id={cell["@_id"]!}
-        name={cell?.["@_name"] ?? ""}
-        getAllUniqueNames={getAllUniqueNames}
-        onChange={(newName) =>
-          updater((dmnObject) => {
-            dmnObject["@_name"] = newName;
-          })
-        }
-      />
+      {root?.output && root.output.length > 1 ? (
+        <NameField
+          alternativeFieldName={undefined}
+          isReadOnly={props.isReadOnly}
+          id={cell["@_id"]!}
+          name={cell?.["@_name"] ?? singleOutputColumn.name}
+          getAllUniqueNames={getAllUniqueNames}
+          onChange={(newName) =>
+            updater((dmnObject) => {
+              dmnObject["@_name"] = newName;
+            })
+          }
+        />
+      ) : (
+        ""
+      )}
       <TypeRefField
         alternativeFieldName={root?.output.length === 1 ? "Column Type" : undefined}
         isReadOnly={cellMustHaveSameTypeAsRoot ? true : props.isReadOnly}