MetadataSchema (Apache Calcite API)

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 Description

static Schema INSTANCE

private static java.util.Map<java.lang.String,Table> TABLE_MAP

Constructor Summary

Constructors
Modifier Constructor Description

private MetadataSchema()
Creates the data dictionary, also called the information schema.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected java.util.Map<java.lang.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, getType, getTypeMap, getTypeNames, 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 java.util.Map<java.lang.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 java.util.Map<java.lang.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