Module datafusion::catalog

Interfaces and default implementations of catalogs and schemas.

Traits:

• CatalogProviderList: a collection of CatalogProviders
• CatalogProvider: a collection of SchemaProviders (sometimes called a “database” in other systems)
• SchemaProvider: a collection of TableProviders (often called a “schema” in other systems)

Implementations

• Simple memory based catalog: MemoryCatalogProviderList, MemoryCatalogProvider, MemorySchemaProvider
• Information schema: information_schema
• Listing schema: listing_schema

Re-exports

• pub use schema::SchemaProvider;

Modules

• information_schema
  InformationSchemaProvider that implements the SQL Information Schema for DataFusion.
• listing_schema
  ListingSchemaProvider: SchemaProvider that scans ObjectStores for tables automatically
• schema
  Describes the interface and built-in implementations of schemas, representing collections of named tables.

Structs

• MemoryCatalogProvider
  Simple in-memory implementation of a catalog.
• MemoryCatalogProviderList
  Simple in-memory list of catalogs
• MemorySchemaProvider
  Simple in-memory implementation of a schema.
• ResolvedTableReference
  A fully resolved path to a table of the form “catalog.schema.table”

Enums

• TableReference
  A multi part identifier (path) to a table that may require further resolution (e.g. foo.bar).

Traits

• CatalogListDeprecated
  See CatalogProviderList
• CatalogProvider
  Represents a catalog, comprising a number of named schemas.
• CatalogProviderList
  Represent a list of named CatalogProviders.

Functions

• resolve_table_references
  Collects all tables and views referenced in the SQL statement. CTEs are collected separately. This can be used to determine which tables need to be in the catalog for a query to be planned.