first commit

packages/nodes-base/nodes/DataTable/actions/table/create.operation.ts

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+import type {
+	CreateDataTableColumnOptions,
+	IDisplayOptions,
+	IExecuteFunctions,
+	INodeExecutionData,
+	INodeProperties,
+} from 'n8n-workflow';
+
+import { getDataTableAggregateProxy } from '../../common/utils';
+
+export const FIELD = 'create';
+
+const displayOptions: IDisplayOptions = {
+	show: {
+		resource: ['table'],
+		operation: [FIELD],
+	},
+};
+
+export const description: INodeProperties[] = [
+	{
+		displayName: 'Name',
+		name: 'tableName',
+		type: 'string',
+		required: true,
+		default: '',
+		placeholder: 'e.g. My Data Table',
+		description: 'The name of the data table to create',
+		displayOptions,
+	},
+	{
+		displayName: 'Columns',
+		name: 'columns',
+		type: 'fixedCollection',
+		typeOptions: {
+			multipleValues: true,
+		},
+		default: {},
+		placeholder: 'Add Column',
+		description: 'The columns to create in the data table',
+		displayOptions,
+		options: [
+			{
+				name: 'column',
+				displayName: 'Column',
+				values: [
+					{
+						displayName: 'Name',
+						name: 'name',
+						type: 'string',
+						default: '',
+						required: true,
+						description: 'The name of the column',
+					},
+					{
+						displayName: 'Type',
+						name: 'type',
+						type: 'options',
+						default: 'string',
+						options: [
+							{ name: 'Boolean', value: 'boolean' },
+							{ name: 'Date', value: 'date' },
+							{ name: 'Number', value: 'number' },
+							{ name: 'String', value: 'string' },
+						],
+						description: 'The type of the column',
+					},
+				],
+			},
+		],
+	},
+	{
+		displayName: 'Options',
+		name: 'options',
+		type: 'collection',
+		placeholder: 'Add Option',
+		default: {},
+		displayOptions,
+		options: [
+			{
+				displayName: 'Reuse Existing Tables',
+				name: 'createIfNotExists',
+				type: 'boolean',
+				default: true,
+				description:
+					'Whether to return existing table if one exists with the same name without throwing an error',
+			},
+		],
+	},
+];
+
+export async function execute(
+	this: IExecuteFunctions,
+	index: number,
+): Promise<INodeExecutionData[]> {
+	const tableName = this.getNodeParameter('tableName', index) as string;
+	const columnsData = this.getNodeParameter('columns.column', index, []) as Array<
+		Pick<CreateDataTableColumnOptions, 'name' | 'type'>
+	>;
+	const options = this.getNodeParameter('options', index, {}) as {
+		createIfNotExists?: boolean;
+	};
+
+	const aggregateProxy = await getDataTableAggregateProxy(this);
+
+	// If "Create If Not Exists" is enabled, check if table already exists
+	if (options.createIfNotExists) {
+		const existingTables = await aggregateProxy.getManyAndCount({
+			filter: { name: tableName },
+			take: 1,
+		});
+
+		// If a table with exact name match exists, return it
+		if (existingTables.data.length > 0 && existingTables.data[0].name === tableName) {
+			return [{ json: existingTables.data[0] }];
+		}
+	}
+
+	const columns: CreateDataTableColumnOptions[] = columnsData.map((col, idx) => ({
+		name: col.name,
+		type: col.type,
+		index: idx,
+	}));
+
+	const result = await aggregateProxy.createDataTable({
+		name: tableName,
+		columns,
+	});
+
+	return [{ json: result }];
+}