.. _auto_dataset_rename_columns:

*DATASET RENAME COLUMNS*
========================

Renames columns in a dataset using a visual mapper, a custom name-mapping definition, or both. Use this worker whenever column headers need to be standardised or relabelled before downstream processing.

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

Classification: **process**.

Tagged: ``columns``, ``dataset``, ``headers``, ``mapping``, ``relabel``, ``rename``, ``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 dataset whose columns are to be renamed; connect any tabular dataset from an upstream worker.
   * - Choose Mapper
     - mapper_input
     - mapper
     - —
     - 
     - Visual mapper that maps existing column names (sourced from dataset_1) to new names; takes precedence for any columns it covers — leave unconnected if using custom_input exclusively.
   * - Custom Map Names
     - custom_input
     - textarea
     - —
     - 
     - JSON or key-value textarea defining additional or alternative old→new column name mappings (e.g. {"col_a": "velocity"}); used together with or instead of mapper_input.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - dataset_rename_columns_output_1
     - dataset_rename_columns_output_1
     - dataset
     - Resulting dataset identical to the input but with column headers replaced according to the supplied mapper and/or custom mapping definitions.

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

.. 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_rename_columns</code>. Schema hash: <code>dae5e6a78ec8</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>