Asset previews

You can see a preview of the contents of many types of data assets and some types of analytical assets. For data assets from files, only files with specific file extensions and mime types have previews.

The content you see in a preview depends on the type of asset, file, or data:

• For relational data, CSV, Avro, partitioned data files, and Parquet files, the preview includes column names, data types, data classes, and a subset of rows of data. Data classes identify the type of content in the column. Data classes are inferred automatically as part of the asset profile. For connected data, you can see when the data in the preview was last fetched from the connection and refresh the preview data in projects and catalogs by clicking Refresh.

• For PDF, text, images, and Microsoft Excel documents, the preview shows the whole document.
• For folder assets, the preview shows the files and subfolders, which you can also preview.

If you see lock icon next to the column name of a relational data asset, it means that the data in the column is anonymized by a data policy. Data policies can anonymize data by masking the original values with similarly formatted values, or by substituting the values and format of the data with meaningless values. Within a catalog, the owner of the asset is not affected by data policies and always sees the original values. Within a project, all project collaborators see the asset the way it looks to the person who adds it from the catalog.

File extensions and mime types of previewed files

These types of files that contain structured data have previews:

These types of image files have previews:

These types of document files have previews: