.. _auto_dataset_get_schema:

*GET SCHEMA FOR THE COLUMNS*
============================

Inspects a dataset and returns a schema table describing each column's name, data type, and basic properties. Optionally restrict schema generation to a specific subset of columns. Use this worker whenever you need to programmatically discover or validate the structure of a dataset before downstream processing.

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

Classification: **process**.

Tagged: ``column_types``, ``dataset_structure``, ``introspection``, ``metadata``, ``schema``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Dataset
     - dataset
     - dataset
     - —
     - 
     - Input dataset whose column schema will be extracted; accepts any tabular dataset available on the platform — leave unconnected only if the schema is to be derived at runtime.
   * - Choose Columns
     - columns
     - scalar
     - —
     - 
     - Optional comma-separated or multi-select list of column names to restrict schema output to; when left blank the schema is generated for all columns in the dataset.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - dataset_get_schema_output_1
     - dataset_get_schema_output_1
     - dataset
     - Tabular dataset where each row describes one column from the input dataset, including at minimum the column name and inferred data type (e.g., string, integer, float, boolean).

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

- data.dataset.transform
- data.statistics

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

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

.. 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_get_schema</code>. Schema hash: <code>9f405b5bc9a2</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>