.. _auto_dataset_add_column:

*DATASET ADD COLUMN*
====================

Appends a new column to an existing dataset by supplying a column name and a comma-separated list of values (one per row). Use this worker whenever a workflow needs to inject a computed, constant, or externally derived column into a tabular dataset before downstream processing.

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

Classification: **process**.

Tagged: ``add_column``, ``column``, ``dataset``, ``tabular``, ``transform``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Dataset
     - dataset
     - dataset
     - —
     - 
     - Input tabular dataset to which the new column will be appended; must be a valid d3VIEW dataset object.
   * - Column Name
     - col_name
     - scalar
     - —
     - 
     - Name (header label) for the new column; must be a non-empty quoted string and should not duplicate an existing column name.
   * - Values
     - values
     - scalar
     - —
     - 
     - Comma-separated list of values to populate the new column, one entry per row; length must match the number of rows in the input dataset.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - Dataset
     - dataset
     - dataset
     - The input dataset with the new named column appended as the last column, preserving all original rows and columns.

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_column <https://www.d3view.com/api/workflow/example?id=dataset_add_column>`_

.. 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_column</code>. Schema hash: <code>8b98e9115bab</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>