| Class | Description | 
|---|---|
| Catalog | 
 Catalog interface for Spark. 
 | 
| CatalogMetadata | 
 A catalog in Spark, as returned by the  
listCatalogs method defined in Catalog. | 
| Column | 
 A column in Spark, as returned by  
listColumns method in Catalog. | 
| Database | 
 A database in Spark, as returned by the  
listDatabases method defined in Catalog. | 
| Function | 
 A user-defined function in Spark, as returned by  
listFunctions method in Catalog. | 
| Table | 
 A table in Spark, as returned by the  
listTables method in Catalog. |