Package org.apache.iceberg.catalog

Interface ViewCatalog

All Known Implementing Classes:

BaseMetastoreViewCatalog, BaseViewSessionCatalog.AsViewCatalog, HiveCatalog, InMemoryCatalog, JdbcCatalog, NessieCatalog, RESTCatalog

public interface ViewCatalog

A Catalog API for view create, drop, and load operations.

Method Summary

Modifier and Type	Method	Description
ViewBuilder	buildView(TableIdentifier identifier)	Instantiate a builder to create or replace a SQL view.
boolean	dropView(TableIdentifier identifier)	Drop a view.
default void	initialize(java.lang.String name, java.util.Map<java.lang.String,java.lang.String> properties)	Initialize a view catalog given a custom name and a map of catalog properties.
default void	invalidateView(TableIdentifier identifier)	Invalidate cached view metadata from current catalog.
java.util.List<TableIdentifier>	listViews(Namespace namespace)	Return all the identifiers under this namespace.
View	loadView(TableIdentifier identifier)	Load a view.
java.lang.String	name()	Return the name for this catalog.
void	renameView(TableIdentifier from, TableIdentifier to)	Rename a view.
default boolean	viewExists(TableIdentifier identifier)	Check whether view exists.

Method Detail

name

java.lang.String name()

Return the name for this catalog.

Returns:

this catalog's name

listViews

java.util.List<TableIdentifier> listViews(Namespace namespace)

Return all the identifiers under this namespace.

Parameters:

namespace - a namespace

Returns:

a list of identifiers for views

Throws:

NoSuchNamespaceException - if the namespace is not found

loadView

View loadView(TableIdentifier identifier)

Load a view.

Parameters:

identifier - a view identifier

Returns:

instance of View implementation referred by the identifier

Throws:

NoSuchViewException - if the view does not exist

viewExists

default boolean viewExists(TableIdentifier identifier)

Check whether view exists.

Parameters:

identifier - a view identifier

Returns:

true if the view exists, false otherwise

buildView

ViewBuilder buildView(TableIdentifier identifier)

Instantiate a builder to create or replace a SQL view.

Parameters:

identifier - a view identifier

Returns:

a view builder

dropView

boolean dropView(TableIdentifier identifier)

Drop a view.

Parameters:

identifier - a view identifier

Returns:

true if the view was dropped, false if the view did not exist

renameView

void renameView(TableIdentifier from,
                TableIdentifier to)

Rename a view.

Parameters:

from - identifier of the view to rename

to - new view identifier

Throws:

NoSuchViewException - if the "from" view does not exist

AlreadyExistsException - if the "to" view already exists

NoSuchNamespaceException - if the "to" namespace doesn't exist

invalidateView

default void invalidateView(TableIdentifier identifier)

Invalidate cached view metadata from current catalog.

If the view is already loaded or cached, drop cached data. If the view does not exist or is not cached, do nothing.

Parameters:

identifier - a view identifier

initialize

default void initialize(java.lang.String name,
                        java.util.Map<java.lang.String,java.lang.String> properties)

Initialize a view catalog given a custom name and a map of catalog properties.

A custom view catalog implementation must have a no-arg constructor. A compute engine like Spark or Flink will first initialize the catalog without any arguments, and then call this method to complete catalog initialization with properties passed into the engine.

Parameters:

name - a custom name for the catalog

properties - catalog properties