feat(execution): experimental batch field resolution

Author: yaacovCR

src/execution/Executor.ts

@@ -279,7 +279,13 @@ describe('Execute: Handles basic execution tasks', () => {
     const field = operation.selectionSet.selections[0];
     expect(resolvedInfo).to.deep.include({
       fieldNodes: [field],
-      path: { prev: undefined, key: 'result', typename: 'Test' },
+      path: {
+        prev: undefined,
+        key: 'result',
+        typename: 'Test',
+        isNullable: true,
+        parentNullablePath: undefined,
+      },
       variableValues: {
         sources: {
           var: {
@@ -366,12 +372,18 @@ describe('Execute: Handles basic execution tasks', () => {
     expect(path).to.deep.equal({
       key: 'l2',
       typename: 'SomeObject',
+      isNullable: true,
+      parentNullablePath: undefined,
       prev: {
         key: 0,
         typename: undefined,
+        isNullable: false,
+        parentNullablePath: undefined,
         prev: {
           key: 'l1',
           typename: 'SomeQuery',
+          isNullable: false,
+          parentNullablePath: undefined,
           prev: undefined,
         },
       },