Package org.apache.calcite.model

Provides model files, in JSON format, defining schemas and other metadata.

See: Description

Class Summary

Class	Description
JsonColumn	JSON object representing a column.
JsonCustomSchema	JSON schema element that represents a custom schema.
JsonCustomTable	Custom table schema element.
JsonFunction	Function schema element.
JsonJdbcSchema	JSON object representing a schema that maps to a JDBC database.
JsonLattice	Element that describes a star schema and provides a framework for defining, recognizing, and recommending materialized views at various levels of aggregation.
JsonMapSchema	JSON object representing a schema whose tables are explicitly specified.
JsonMaterialization	Element that describes how a table is a materialization of a query.
JsonMeasure	An aggregate function applied to a column (or columns) of a lattice.
JsonRoot	Root schema element.
JsonSchema	Schema schema element.
JsonStream	Information about whether a table allows streaming.
JsonTable	Table schema element.
JsonTile	Materialized view within a JsonLattice.
JsonView	View schema element.
ModelHandler	Reads a model and creates schema objects accordingly.

Enum Summary

Enum	Description
ModelHandler.ExtraOperand	Extra operands automatically injected into a JsonCustomSchema.operand, as extra context for the adapter.

Package org.apache.calcite.model Description

Provides model files, in JSON format, defining schemas and other metadata.

Models are specified using a model=<uri> parameter on the JDBC connect string. Calcite loads the model while initializing the connection. It first parses the JSON, then uses a ModelHandler as visitor over the parse tree.

There are standard implementations of schema and table, but the user can provide their own by implementing the SchemaFactory or TableFactory interfaces and including a custom schema in the model.

There are several examples of schemas in the optiq-csv tutorial.