DelegatingCatalogExtension¶

DelegatingCatalogExtension is an extension of the CatalogExtension abstraction for catalogs that delegate unsupported catalog extensions to the Delegate Catalog.

DelegatingCatalogExtension is a convenience abstraction so that Spark extensions developers can focus on a subset of the CatalogExtension features.

Delegate Catalog¶

DelegatingCatalogExtension can be given a CatalogPlugin to handle the following (unless overriden):

• name
• defaultNamespace
• asTableCatalog
• asNamespaceCatalog
• asFunctionCatalog

The CatalogPlugin is assigned at setDelegateCatalog.

setDelegateCatalog¶

void setDelegateCatalog(
  CatalogPlugin delegate)

setDelegateCatalog sets this CatalogPlugin.