org.apache.calcite.jdbc

Class MetadataSchema

java.lang.Object

org.apache.calcite.schema.impl.AbstractSchema

org.apache.calcite.jdbc.MetadataSchema

All Implemented Interfaces:

Schema

class MetadataSchema
extends AbstractSchema

Schema that contains metadata tables such as "TABLES" and "COLUMNS".

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.schema.impl.AbstractSchema

AbstractSchema.Factory

Nested classes/interfaces inherited from interface org.apache.calcite.schema.Schema

Schema.TableType

Field Summary

Fields

Modifier and Type	Field and Description
static Schema	INSTANCE
private static Map<String,Table>	TABLE_MAP

Constructor Summary

Constructors

Modifier	Constructor and Description
private	MetadataSchema() Creates the data dictionary, also called the information schema.

Method Summary

Modifier and Type	Method and Description
protected Map<String,Table>	getTableMap() Returns a map of tables in this schema by name.

Methods inherited from class org.apache.calcite.schema.impl.AbstractSchema

getExpression, getFunctionMultimap, getFunctionNames, getFunctions, getSubSchema, getSubSchemaMap, getSubSchemaNames, getTable, getTableNames, isMutable, snapshot

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TABLE_MAP

private static final Map<String,Table> TABLE_MAP

INSTANCE

public static final Schema INSTANCE

Constructor Detail

MetadataSchema

private MetadataSchema()

Creates the data dictionary, also called the information schema. It is a schema called "metadata" that contains tables "TABLES", "COLUMNS" etc.

Method Detail

getTableMap

protected Map<String,Table> getTableMap()

Description copied from class: AbstractSchema

Returns a map of tables in this schema by name.

The implementations of AbstractSchema.getTableNames() and AbstractSchema.getTable(String) depend on this map. The default implementation of this method returns the empty map. Override this method to change their behavior.

Overrides:

getTableMap in class AbstractSchema

Returns:

Map of tables in this schema by name