While almost every platform now supports open formats, what makes a catalog truly open? An open catalog keeps your data in storage you own, gives you the best features there, and supports data portability: the ability to move your tables to another catalog while keeping the data in place. Portability is a core tenet of an open lakehouse, and it’s where most catalogs fall short.
Official announcementDatabricks Blog
What makes a catalog open? Unity Catalog Advances the Open Lakehouse
From the official release
As the first catalog to support both REGISTER and UNREGISTER from the Apache Iceberg™ REST catalog spec, Unity Catalog in Databricks' Open Lakehouse expands what an open catalog means: your tables can move existing Iceberg tables in or out without any data movement. Databricks contributed UNREGISTER to the Iceberg REST catalog spec, making this an open standard. Read Unlocking Data Portability.
This is a short excerpt. Read the full announcement on the official source.
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