DelegatingNamespace (Apache Calcite API)

java.lang.Object
- org.apache.calcite.sql.validate.DelegatingNamespace

All Implemented Interfaces:

SqlValidatorNamespace
```
public abstract class DelegatingNamespace
extends Object
implements SqlValidatorNamespace
```
An implementation of SqlValidatorNamespace that delegates all methods to an underlying object.

Field Summary

Fields
Modifier and Type Field and Description

protected SqlValidatorNamespace namespace

Fields
Modifier and Type	Field and Description
`protected SqlValidatorNamespace`	`namespace`

Constructor Summary

Constructors
Modifier Constructor and Description

protected DelegatingNamespace(SqlValidatorNamespace namespace)
Creates a DelegatingNamespace.

Constructors
Modifier	Constructor and Description
`protected`	`DelegatingNamespace(SqlValidatorNamespace namespace)` Creates a DelegatingNamespace.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`fieldExists(String name)` Returns whether this namespace has a field of a given name.
`@Nullable SqlNode`	`getEnclosingNode()` Returns the parse tree node that at is at the root of this namespace and includes all decorations.
`List<Pair<SqlNode,SqlMonotonicity>>`	`getMonotonicExprs()` Returns a list of expressions which are monotonic in this namespace.
`SqlMonotonicity`	`getMonotonicity(String columnName)` Returns whether and how a given column is sorted.
`@Nullable SqlNode`	`getNode()` Returns the parse tree node at the root of this namespace.
`RelDataType`	`getRowType()` Returns the row type of this namespace, which comprises a list of names and types of the output columns.
`RelDataType`	`getRowTypeSansSystemColumns()` Returns the row type of this namespace, sans any system columns.
`@Nullable SqlValidatorTable`	`getTable()` Returns the underlying table, or null if there is none.
`RelDataType`	`getType()` Returns the type of this namespace.
`SqlValidator`	`getValidator()` Returns the validator.
`boolean`	`isWrapperFor(Class<?> clazz)` Returns whether this namespace implements a given interface, or wraps a class which does.
`@Nullable SqlValidatorNamespace`	`lookupChild(String name)` Looks up a child namespace of a given name.
`void`	`makeNullable()`
`void`	`setType(RelDataType type)` Sets the type of this namespace.
`<T> T`	`unwrap(Class<T> clazz)` Returns this namespace, or a wrapped namespace, cast to a particular class.
`void`	`validate(RelDataType targetRowType)` Validates this namespace.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.calcite.sql.validate.SqlValidatorNamespace
resolve, supportsModality

- Field Detail
  - namespace
```
protected final SqlValidatorNamespace namespace
```
- Constructor Detail
  - DelegatingNamespace
```
protected DelegatingNamespace(SqlValidatorNamespace namespace)
```
    Creates a DelegatingNamespace.
    
    Parameters:
    
    namespace - Underlying namespace, to delegate to
- Method Detail
  - getValidator
```
public SqlValidator getValidator()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the validator.
    
    Specified by:
    
    getValidator in interface SqlValidatorNamespace
    
    Returns:
    
    validator
  - getTable
```
public @Nullable SqlValidatorTable getTable()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the underlying table, or null if there is none.
    
    Specified by:
    
    getTable in interface SqlValidatorNamespace
  - getRowType
```
public RelDataType getRowType()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the row type of this namespace, which comprises a list of names and types of the output columns. If the scope's type has not yet been derived, derives it.
    
    Specified by:
    
    getRowType in interface SqlValidatorNamespace
    
    Returns:
    
    Row type of this namespace, never null, always a struct
  - setType
```
public void setType(RelDataType type)
```
    Description copied from interface: SqlValidatorNamespace
    
    Sets the type of this namespace.
    Allows the type for the namespace to be explicitly set, but usually is called during SqlValidatorNamespace.validate(RelDataType).
    
    Implicitly also sets the row type. If the type is not a struct, then the row type is the type wrapped as a struct with a single column, otherwise the type and row type are the same.
    
    Specified by:
    
    setType in interface SqlValidatorNamespace
  - getRowTypeSansSystemColumns
```
public RelDataType getRowTypeSansSystemColumns()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the row type of this namespace, sans any system columns.
    
    Specified by:
    
    getRowTypeSansSystemColumns in interface SqlValidatorNamespace
    
    Returns:
    
    Row type sans system columns
  - getType
```
public RelDataType getType()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the type of this namespace.
    
    Specified by:
    
    getType in interface SqlValidatorNamespace
    
    Returns:
    
    Row type converted to struct
  - validate
```
public void validate(RelDataType targetRowType)
```
    Description copied from interface: SqlValidatorNamespace
    
    Validates this namespace.
    If the scope has already been validated, does nothing.
    
    Please call SqlValidatorImpl.validateNamespace(org.apache.calcite.sql.validate.SqlValidatorNamespace, org.apache.calcite.rel.type.RelDataType) rather than calling this method directly.
    
    Specified by:
    
    validate in interface SqlValidatorNamespace
    
    Parameters:
    
    targetRowType - Desired row type, must not be null, may be the data type 'unknown'.
  - getNode
```
public @Nullable SqlNode getNode()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the parse tree node at the root of this namespace.
    
    Specified by:
    
    getNode in interface SqlValidatorNamespace
    
    Returns:
    
    parse tree node; null for TableNamespace
  - getEnclosingNode
```
public @Nullable SqlNode getEnclosingNode()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns the parse tree node that at is at the root of this namespace and includes all decorations. If there are no decorations, returns the same as SqlValidatorNamespace.getNode().
    
    Specified by:
    
    getEnclosingNode in interface SqlValidatorNamespace
  - lookupChild
```
public @Nullable SqlValidatorNamespace lookupChild(String name)
```
    Description copied from interface: SqlValidatorNamespace
    
    Looks up a child namespace of a given name.
    For example, in the query select e.name from emps as e, e is an IdentifierNamespace which has a child name which is a FieldNamespace.
    
    Specified by:
    
    lookupChild in interface SqlValidatorNamespace
    
    Parameters:
    
    name - Name of namespace
    
    Returns:
    
    Namespace
  - fieldExists
```
public boolean fieldExists(String name)
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns whether this namespace has a field of a given name.
    
    Specified by:
    
    fieldExists in interface SqlValidatorNamespace
    
    Parameters:
    
    name - Field name
    
    Returns:
    
    Whether field exists
  - getMonotonicExprs
```
public List<Pair<SqlNode,SqlMonotonicity>> getMonotonicExprs()
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns a list of expressions which are monotonic in this namespace. For example, if the namespace represents a relation ordered by a column called "TIMESTAMP", then the list would contain a SqlIdentifier called "TIMESTAMP".
    
    Specified by:
    
    getMonotonicExprs in interface SqlValidatorNamespace
  - getMonotonicity
```
public SqlMonotonicity getMonotonicity(String columnName)
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns whether and how a given column is sorted.
    
    Specified by:
    
    getMonotonicity in interface SqlValidatorNamespace
  - makeNullable
```
public void makeNullable()
```
    Specified by:
    
    makeNullable in interface SqlValidatorNamespace
  - unwrap
```
public <T> T unwrap(Class<T> clazz)
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns this namespace, or a wrapped namespace, cast to a particular class.
    
    Specified by:
    
    unwrap in interface SqlValidatorNamespace
    
    Parameters:
    
    clazz - Desired type
    
    Returns:
    
    This namespace cast to desired type
  - isWrapperFor
```
public boolean isWrapperFor(Class<?> clazz)
```
    Description copied from interface: SqlValidatorNamespace
    
    Returns whether this namespace implements a given interface, or wraps a class which does.
    
    Specified by:
    
    isWrapperFor in interface SqlValidatorNamespace
    
    Parameters:
    
    clazz - Interface
    
    Returns:
    
    Whether namespace implements given interface

Class DelegatingNamespace

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.calcite.sql.validate.SqlValidatorNamespace

Field Detail

namespace

Constructor Detail

DelegatingNamespace

Method Detail

getValidator

getTable

getRowType

setType

getRowTypeSansSystemColumns

getType

validate

getNode

getEnclosingNode

lookupChild

fieldExists

getMonotonicExprs

getMonotonicity

makeNullable

unwrap

isWrapperFor