docs-archive/apache-airflow-providers-presto/2.2.1/_sources/operators/transfer/gcs_to_presto.rst.txt

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Google Cloud Storage to Presto Transfer Operator
================================================

Google has a service `Google Cloud Storage <https://cloud.google.com/storage/>`__. This service is
used to store large data from various applications.

`Presto <https://prestodb.io/>`__ is an open source distributed SQL query engine for running interactive
analytic queries against data sources of all sizes ranging from gigabytes to petabytes. Presto allows
querying data where it lives, including Hive, Cassandra, relational databases or even proprietary data stores.
A single Presto query can combine data from multiple sources, allowing for analytics across your entire
organization.


Prerequisite Tasks
^^^^^^^^^^^^^^^^^^

.. include::/operators/_partials/prerequisite_tasks.rst

.. _howto/operator:GCSToPresto:

Load CSV from GCS to Presto Table
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

To load a CSV file from Google Cloud Storage to a Presto table you can use the
:class:`~airflow.providers.presto.transfers.gcs_to_presto.GCSToPrestoOperator`.

This operator assumes that CSV does not have headers and the data is corresponding to the columns in a
pre-existing presto table. Optionally, you can provide schema as tuple/list of strings or as a path to a
JSON file in the same bucket as the CSV file.

.. exampleinclude:: /../../airflow/providers/presto/example_dags/example_gcs_to_presto.py
    :language: python
    :dedent: 4
    :start-after: [START gcs_csv_to_presto_table]
    :end-before: [END gcs_csv_to_presto_table]