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 +76,6 @@ enum DecisionTableColumnType {
   OutputClause = "output",
   Annotation = "annotation",
 }
-
 export const DECISION_TABLE_INPUT_DEFAULT_VALUE = "-";
 export const DECISION_TABLE_OUTPUT_DEFAULT_VALUE = "";
 export const DECISION_TABLE_ANNOTATION_DEFAULT_VALUE = "";
@@ -777,7 +776,15 @@ export function DecisionTableExpression({
               });
             }
 
-            const nextOutputColumns = [...(prev.output ?? [])];
+            const nextOutputColumns = [
+              ...(prev.output ?? []).map((outputColumn, index) => {
+                const outputCopy = { ...outputColumn };
+                if (outputCopy["@_name"] == null) {
+                  outputCopy["@_name"] = `Output-${index + 1}`;
+                }
+                return outputCopy;
+              }),
+            ];
             for (/* Add new columns */ let i = 0; i < outputColumnsToAdd.length; i++) {
               nextOutputColumns.splice(localIndexInsideGroup + i, 0, outputColumnsToAdd[i]);
             }

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

@@ -230,7 +230,7 @@ export function getDefaultBoxedExpression({
     return relationExpression;
   } else if (logicType === "decisionTable") {
     const singleOutputColumn = {
-      name: "Output-1",
+      name: undefined,
       typeRef: dataType?.feelName,
     };
     const singleInputColumn = {

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

@@ -45,7 +45,6 @@ export function DecisionTableOutputHeaderCell(props: {
   const activeDrgElementId = useDmnEditorStore((s) => s.boxedExpressionEditor.activeDrgElementId);
   const { dmnEditorRootElementRef } = useDmnEditor();
   const { externalModelsByNamespace } = useExternalModels();
-
   const node = useDmnEditorStore((s) =>
     s
       .computed(s)
@@ -172,18 +171,21 @@ 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
+          isReadOnly={props.isReadOnly}
+          id={cell["@_id"]!}
+          name={cell?.["@_name"] ?? ""}
+          getAllUniqueNames={getAllUniqueNames}
+          onChange={(newName) =>
+            updater((dmnObject) => {
+              dmnObject["@_name"] = newName;
+            })
+          }
+        />
+      ) : (
+        ""
+      )}
       <TypeRefField
         alternativeFieldName={root?.output.length === 1 ? "Column Type" : undefined}
         isReadOnly={cellMustHaveSameTypeAsRoot ? true : props.isReadOnly}