feat(Split In Batches Node): Make it easy to combine processed data

packages/nodes-base/nodes/SplitInBatches/SplitInBatches.node.ts

@@ -20,7 +20,9 @@ export class SplitInBatches implements INodeType {
 			color: '#007755',
 		},
 		inputs: ['main'],
-		outputs: ['main'],
+		// eslint-disable-next-line n8n-nodes-base/node-class-description-outputs-wrong
+		outputs: ['main', 'main'],
+		outputNames: ['loop', 'done'],
 		properties: [
 			{
 				displayName:
@@ -84,8 +86,11 @@ export class SplitInBatches implements INodeType {
 			// Get the items which should be returned
 			returnItems.push.apply(returnItems, items.splice(0, batchSize));
 
-			// Set the other items to be saved in the context to return at later runs
+			// Save the incoming items to be able to return them for later runs
 			nodeContext.items = [...items];
+
+			// Reset processedItems as they get only added starting from the first iteration
+			nodeContext.processedItems = [];
 		} else {
 			// The node has been called before. So return the next batch of items.
 			nodeContext.currentRunIndex += 1;
@@ -125,6 +130,20 @@ export class SplitInBatches implements INodeType {
 				return addSourceOverwrite(item.pairedItem);
 			}
 
+			const sourceOverwrite = this.getInputSourceData();
+
+			const newItems = items.map((item, index) => {
+				return {
+					...item,
+					pairedItem: {
+						sourceOverwrite,
+						item: index,
+					},
+				};
+			});
+
+			nodeContext.processedItems = [...nodeContext.processedItems, ...newItems];
+
 			returnItems.map((item) => {
 				item.pairedItem = getPairedItemInformation(item);
 			});
@@ -133,10 +152,9 @@ export class SplitInBatches implements INodeType {
 		nodeContext.noItemsLeft = nodeContext.items.length === 0;
 
 		if (returnItems.length === 0) {
-			// No data left to return so stop execution of the branch
-			return null;
+			return [[], nodeContext.processedItems];
 		}
 
-		return [returnItems];
+		return [returnItems, []];
 	}
 }

packages/nodes-base/nodes/SplitInBatches/test/SplitInBatches.combineData.json

@@ -0,0 +1,203 @@
+{
+	"name": "SplitinBatches Test",
+	"nodes": [
+		{
+			"parameters": {},
+			"id": "f35d9ed9-a095-4555-b445-b22ab2bd4670",
+			"name": "When clicking \"Execute Workflow\"",
+			"type": "n8n-nodes-base.manualTrigger",
+			"typeVersion": 1,
+			"position": [860, 400]
+		},
+		{
+			"parameters": {
+				"jsCode": "const newItems = [];\n\nfor (let i=0;i<10;i++) {\n  newItems.push({json:{i}});\n}\n\nreturn newItems;"
+			},
+			"id": "3962fba9-8f67-4b16-b2a2-69fc4b374fc8",
+			"name": "Create Test Data",
+			"type": "n8n-nodes-base.code",
+			"typeVersion": 1,
+			"position": [1080, 400]
+		},
+		{
+			"parameters": {
+				"batchSize": 3,
+				"options": {}
+			},
+			"name": "SplitInBatches1",
+			"type": "n8n-nodes-base.splitInBatches",
+			"typeVersion": 1,
+			"position": [1340, 400],
+			"id": "02d51797-ae62-4fd6-b703-426a4b3fb951"
+		},
+		{
+			"parameters": {},
+			"id": "ceebf988-a81f-4e57-8917-f3d1af0742e0",
+			"name": "Do something",
+			"type": "n8n-nodes-base.noOp",
+			"typeVersion": 1,
+			"position": [1540, 380]
+		},
+		{
+			"parameters": {},
+			"id": "82598a32-3ede-4a1b-b7ec-e5d0e39b71c7",
+			"name": "Done",
+			"type": "n8n-nodes-base.noOp",
+			"typeVersion": 1,
+			"position": [1780, 620]
+		},
+		{
+			"parameters": {
+				"values": {
+					"string": [
+						{
+							"value": "=A-{{ $runIndex }}-{{ $itemIndex }}"
+						}
+					]
+				},
+				"options": {}
+			},
+			"id": "c05f63fd-057b-4bdc-8559-1ae5789be346",
+			"name": "Set",
+			"type": "n8n-nodes-base.set",
+			"typeVersion": 1,
+			"position": [1760, 380]
+		}
+	],
+	"pinData": {
+		"Done": [
+			{
+				"json": {
+					"i": 0,
+					"propertyName": "A-0-0"
+				}
+			},
+			{
+				"json": {
+					"i": 1,
+					"propertyName": "A-0-1"
+				}
+			},
+			{
+				"json": {
+					"i": 2,
+					"propertyName": "A-0-2"
+				}
+			},
+			{
+				"json": {
+					"i": 3,
+					"propertyName": "A-1-0"
+				}
+			},
+			{
+				"json": {
+					"i": 4,
+					"propertyName": "A-1-1"
+				}
+			},
+			{
+				"json": {
+					"i": 5,
+					"propertyName": "A-1-2"
+				}
+			},
+			{
+				"json": {
+					"i": 6,
+					"propertyName": "A-2-0"
+				}
+			},
+			{
+				"json": {
+					"i": 7,
+					"propertyName": "A-2-1"
+				}
+			},
+			{
+				"json": {
+					"i": 8,
+					"propertyName": "A-2-2"
+				}
+			},
+			{
+				"json": {
+					"i": 9,
+					"propertyName": "A-3-0"
+				}
+			}
+		]
+	},
+	"connections": {
+		"When clicking \"Execute Workflow\"": {
+			"main": [
+				[
+					{
+						"node": "Create Test Data",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		},
+		"SplitInBatches1": {
+			"main": [
+				[
+					{
+						"node": "Do something",
+						"type": "main",
+						"index": 0
+					}
+				],
+				[
+					{
+						"node": "Done",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		},
+		"Do something": {
+			"main": [
+				[
+					{
+						"node": "Set",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		},
+		"Set": {
+			"main": [
+				[
+					{
+						"node": "SplitInBatches1",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		},
+		"Create Test Data": {
+			"main": [
+				[
+					{
+						"node": "SplitInBatches1",
+						"type": "main",
+						"index": 0
+					}
+				]
+			]
+		}
+	},
+	"active": false,
+	"settings": {},
+	"versionId": "d7a267d4-df50-457d-b473-850d43e49685",
+	"id": "1088",
+	"meta": {
+		"instanceId": "021d3c82ba2d3bc090cbf4fc81c9312668bcc34297e022bb3438c5c88a43a5ff"
+	},
+	"tags": []
+}