Package org.apache.calcite.sql.validate

Class DelegatingNamespace

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	Description
protected final SqlValidatorNamespace	namespace

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
@Nullable RelDataTypeField	field(String name)	Returns a field of a given name, or null.
@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

fieldExists, resolve, supportsModality

Field Details

namespace

protected final SqlValidatorNamespace namespace

Constructor Details

DelegatingNamespace

protected DelegatingNamespace(SqlValidatorNamespace namespace)

Creates a DelegatingNamespace.

Parameters:

namespace - Underlying namespace, to delegate to

Method Details

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

field

public @Nullable RelDataTypeField field(String name)

Description copied from interface: SqlValidatorNamespace

Returns a field of a given name, or null.

Specified by:

field in interface SqlValidatorNamespace

Parameters:

name - Field name

Returns:

Field, or null

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