FunctionCatalog¶

FunctionCatalog is an extension of the CatalogPlugin abstraction for function catalogs.

FunctionCatalog is registered using spark.sql.catalog configuration property (as are CatalogPlugins).

Contract (Subset)¶

Listing Functions¶

Identifier[] listFunctions(
  String[] namespace)

See:

• V2SessionCatalog

Used when:

• ShowFunctionsExec is requested to run

Loading Function¶

UnboundFunction loadFunction(
  Identifier ident)

See:

• V2SessionCatalog

Used when:

• DelegatingCatalogExtension is requested to loadFunction
• FunctionCatalog is requested to functionExists
• ResolveFunctions logical analysis rule is requested to resolveV2Function
• V2ExpressionUtils is requested to loadV2FunctionOpt
• CatalogV2Util is requested to load a function

Implementations¶

• CatalogExtension
• JDBCTableCatalog
• V2SessionCatalog