.. _auto_dataset_add_counter:

*DATASET ADD COUNTER*
=====================

Appends a sequential counter column to a dataset, starting at a configurable value and stepping by a configurable increment. Use this worker to add row-index or enumeration columns to any tabular dataset before downstream processing.

When to use
-----------

Classification: **process**.

Tagged: ``add_column``, ``counter``, ``dataset``, ``enumeration``, ``row_index``, ``transform``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Choose Dataset
     - dataset_1
     - dataset
     - —
     - 
     - Input tabular dataset to which the counter column will be appended; accepts any dataset type available in the platform.
   * - Choose Column
     - col_name
     - scalar
     - —
     - 
     - Name of the existing column used to anchor or label the counter; leave blank to simply append the counter as a new column without reference to an existing one.
   * - Start Number
     - start_number
     - text
     - 1
     - 
     - Integer (or float) value at which the counter begins; defaults to 1, e.g. set to 0 for zero-based indexing.
   * - Increment
     - increment
     - text
     - 1
     - 
     - Step size added between successive counter values; defaults to 1 for a simple sequential counter, set to a larger value for sparse enumeration.

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - Dataset with Scaled Column
     - dataset_scale_column_output_1
     - dataset
     - Output dataset identical to the input but with an additional counter column appended, populated from start_number and incremented by the specified step for every row.

Disciplines
-----------

- data.dataset.transform

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=dataset_add_counter <https://www.d3view.com/api/workflow/example?id=dataset_add_counter>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>dataset_add_counter</code>. Schema hash: <code>01619e1db9c0</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>