| Class | Description | 
|---|---|
| Catalog | Catalog interface for Spark. | 
| CatalogMetadata | A catalog in Spark, as returned by the  listCatalogsmethod defined inCatalog. | 
| Column | A column in Spark, as returned by  listColumnsmethod inCatalog. | 
| Database | A database in Spark, as returned by the  listDatabasesmethod defined inCatalog. | 
| Function | A user-defined function in Spark, as returned by  listFunctionsmethod inCatalog. | 
| Table | A table in Spark, as returned by the  listTablesmethod inCatalog. |