What feature of Delta Lake allows you to retrieve data from previous versions of a table?

The feature of Delta Lake that enables retrieval of data from previous versions of a table is Time Travel. Time Travel allows users to query historical data by specifying a timestamp or a version number, offering a powerful way to access past states of the data. This capability is particularly useful for auditing, debugging, or recovering data that may have been inadvertently changed or deleted.

Delta Lake accomplishes this by maintaining a transaction log that records changes to the tables, enabling the system to reconstruct prior versions as needed. By leveraging Time Travel, users can manage their data with greater flexibility and reliability, effectively enhancing data governance and auditing processes.

Other features mentioned, like Spark Structured Streaming, enable real-time data processing, while Catalog Tables refer to the way tables are organized in the data catalog but do not directly relate to accessing historical data. Data Versioning is a broader concept but is typically encompassed within the Time Travel feature in Delta Lake, making it less specific in terms of the ability to retrieve previous data states.