--- title: "View schema and override data types" slug: "override-data-type" updated: 2025-06-04T10:50:34Z published: 2025-06-04T10:50:34Z canonical: "bobsled.com/override-data-type" --- > ## Documentation Index > Fetch the complete documentation index at: https://bobsled.com/llms.txt > Use this file to discover all available pages before exploring further. # View schema and override data types Bobsled allows you to observe the inferred schema and optionally overrides the data type of the source data to a Cloud Data Warehouse [destination](/v2/docs/destinations), mediated by [Bobsled data types](/v2/docs/data-types). It’s useful to get acquainted with how Bobsled maps the source data type to the destination to ensure your target data type meets your requirements. This article will describe the steps to: - **Override** a **data type** within a data transfer and, - Observe the **schema** in a Share after setting up a data transfer Bobsled introduces two columns to your schema, which are required to ensure your data is successfully loaded to the preferred Cloud Data Warehouse destination. - `_META_LOADED_AT`: `TIMESTAMP_TZ` **(UTC)** - `_META_SOURCE_FILE_NAME`: `STRING` > [!NOTE] > **NOTE:** Bobsled does not allow you to override these data types, and will always inform you that they are Bobsled generated and required. For more information, contact your account team. --- ## Prerequisites - A [Share](/v2/docs/configure-share) must be created. - To successfully create a [data transfer](/v2/docs/transferring-data) in a share, you must have at least one [Data source](/v2/docs/sources) preconfigured in Bobsled. - If you’re sharing data to a Bobsled-managed destination, all you need to do is pick where you want your data to be shared. Sharing to an externally managed destination may require more details before you are ready to start creating a transfer. Check our supported [Destinations](/v2/docs/destinations) for more information. > [!NOTE] > **NOTE:** What you can see and do will differ based on your [**role and permissions**](https://docs.bobsled.co/v2/docs/users-and-roles). --- ## Override data type guide 1. Within a share (with a source and cloud data warehouse destination), click the **create transfer** button 2. Choose your source entities to share (paths if your source is a file storage, or entities if the source is another cloud data warehouse), click **continue** 3. In the table transfer configuration step, locate and select the **schema** icon > [!NOTE] > **NOTE:** While Bobsled is inferring the schema of your source path for **File Storage** [**Sources**](/v2/docs/sources), the Schema modal will relay the ‘No columns available’. **TIP:** For **File Storage** [**Sources**](/v2/docs/sources), Bobsled allow’s you to re-infer the schema. Locate and select the **Re-infer schema** button in this modal to do so. 1. In the schema modal, locate the data type that you wish to override and click the value **drop-down** ![](https://cdn.document360.io/87a415ff-4d6a-4c0c-adbb-26c563a2d9a8/Images/Documentation/is2.png) ![](https://cdn.document360.io/87a415ff-4d6a-4c0c-adbb-26c563a2d9a8/Images/Documentation/is1.png) > [!NOTE] > **TIP:** Bobsled provides feedback on which data type was overridden. **Hover** over the **swap** icon (two-way arrow) to see the original inferred value. 1. Choose the desired data type, and select **save**. 2. Continue with the [data transfer](/v2/docs/transferring-data) setup, and click **start transfer**. ### Override a data type on an existing data transfer In the event you need to override a data type after a data transfer has already been performed, follow the steps required for [editing](https://docs.bobsled.co/docs/transferring-data#edit-a-data-transfer) a data transfer and perform the desired changes. The Bobsled application will advise you that editing may result in breaking changes. ![](https://cdn.document360.io/87a415ff-4d6a-4c0c-adbb-26c563a2d9a8/Images/Documentation/is5.png) > [!NOTE] > **TIP:** In this scenario, if you wish to override the data type on an already existing data transfer, it is advisable to trigger a back-fill for your source data to avoid breaking changes. This may vary pending on the loading patterns in your [data transfer](/v2/docs/transferring-data). Reach out to your account team to assist you. --- ## View schema Bobsled allows you to observe the data transfer in two ways: - In the **review** screen during the [data transfer](/v2/docs/transferring-data) setup, locate and select the **schema** icon. ![](https://cdn.document360.io/87a415ff-4d6a-4c0c-adbb-26c563a2d9a8/Images/Documentation/ris1(1).png) - On the share page, in the data transfer box, select the **more** (ellipsis) icon, click the **view** option, and locate and select the **schema** icon you wish to observe ![](https://cdn.document360.io/87a415ff-4d6a-4c0c-adbb-26c563a2d9a8/Images/Documentation/is3(1).png)