Transformations: GroupToMatrix add 0 as special value (#97642)

* Add support for 0 empty value

* Remove only

* Add zero option

packages/grafana-data/src/transformations/transformers/groupingToMatrix.test.ts

@@ -105,11 +105,18 @@ describe('Grouping to Matrix', () => {
     });
   });
 
-  it('generates Matrix with empty entries', async () => {
+  it.each([
+    [undefined, ''],
+    [SpecialValue.Null, null],
+    [SpecialValue.False, false],
+    [SpecialValue.True, true],
+    [SpecialValue.Empty, ''],
+    [SpecialValue.Zero, 0],
+  ])('generates Matrix with empty entries', async (emptyValue, expectedValue) => {
     const cfg: DataTransformerConfig<GroupingToMatrixTransformerOptions> = {
       id: DataTransformerID.groupingToMatrix,
       options: {
-        emptyValue: SpecialValue.Null,
+        emptyValue: emptyValue,
       },
     };
 
@@ -133,13 +140,13 @@ describe('Grouping to Matrix', () => {
         {
           name: '1000',
           type: FieldType.number,
-          values: [1, null],
+          values: [1, expectedValue],
           config: {},
         },
         {
           name: '1001',
           type: FieldType.number,
-          values: [null, 2],
+          values: [expectedValue, 2],
           config: {},
         },
       ];

packages/grafana-data/src/transformations/transformers/groupingToMatrix.ts

@@ -183,6 +183,8 @@ function getSpecialValue(specialValue: SpecialValue) {
       return true;
     case SpecialValue.Null:
       return null;
+    case SpecialValue.Zero:
+      return 0;
     case SpecialValue.Empty:
     default:
       return '';

packages/grafana-data/src/types/transformations.ts

@@ -115,4 +115,5 @@ export enum SpecialValue {
   False = 'false',
   Null = 'null',
   Empty = 'empty',
+  Zero = 'zero',
 }

public/app/features/transformers/editors/GroupingToMatrixTransformerEditor.tsx

@@ -62,6 +62,7 @@ export const GroupingToMatrixTransformerEditor = ({
     { label: 'Null', value: SpecialValue.Null, description: 'Null value' },
     { label: 'True', value: SpecialValue.True, description: 'Boolean true value' },
     { label: 'False', value: SpecialValue.False, description: 'Boolean false value' },
+    { label: 'Zero', value: SpecialValue.Zero, description: 'Number 0 value' },
     { label: 'Empty', value: SpecialValue.Empty, description: 'Empty string' },
   ];