org.apache.calcite.sql.validate

Class SelectNamespace

java.lang.Object

org.apache.calcite.sql.validate.AbstractNamespace

org.apache.calcite.sql.validate.SelectNamespace

All Implemented Interfaces:

SqlValidatorNamespace

public class SelectNamespace
extends AbstractNamespace

Namespace offered by a sub-query.

See Also:

SelectScope, SetopNamespace

Field Summary

Fields

Modifier and Type	Field and Description
private SqlSelect	select

Fields inherited from class org.apache.calcite.sql.validate.AbstractNamespace

enclosingNode, rowType, type, validator

Constructor Summary

Constructors

Constructor and Description
SelectNamespace(SqlValidatorImpl validator, SqlSelect select, SqlNode enclosingNode) Creates a SelectNamespace.

Method Summary

Modifier and Type	Method and Description
SqlMonotonicity	getMonotonicity(String columnName) Returns whether and how a given column is sorted.
SqlSelect	getNode() Returns the parse tree node at the root of this namespace.
boolean	supportsModality(SqlModality modality) Returns whether this namespace is capable of giving results of the desired modality.
RelDataType	validateImpl(RelDataType targetRowType) Validates this scope and returns the type of the records it returns.

Methods inherited from class org.apache.calcite.sql.validate.AbstractNamespace

convertToStruct, fieldExists, getEnclosingNode, getMonotonicExprs, getRowType, getRowTypeSansSystemColumns, getTable, getType, getValidator, isWrapperFor, lookupChild, makeNullable, resolve, setType, toStruct, translate, unwrap, validate

Methods inherited from class java.lang.Object

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

Field Detail

select

private final SqlSelect select

Constructor Detail

SelectNamespace

public SelectNamespace(SqlValidatorImpl validator,
                       SqlSelect select,
                       SqlNode enclosingNode)

Creates a SelectNamespace.

Parameters:

validator - Validate

select - Select node

enclosingNode - Enclosing node

Method Detail

getNode

public SqlSelect getNode()

Description copied from interface: SqlValidatorNamespace

Returns the parse tree node at the root of this namespace.

Returns:

parse tree node; null for TableNamespace

validateImpl

public RelDataType validateImpl(RelDataType targetRowType)

Description copied from class: AbstractNamespace

Validates this scope and returns the type of the records it returns. External users should call AbstractNamespace.validate(org.apache.calcite.rel.type.RelDataType), which uses the AbstractNamespace.status field to protect against cycles.

Specified by:

validateImpl in class AbstractNamespace

Parameters:

targetRowType - Desired row type, must not be null, may be the data type 'unknown'.

Returns:

record data type, never null

supportsModality

public boolean supportsModality(SqlModality modality)

Description copied from interface: SqlValidatorNamespace

Returns whether this namespace is capable of giving results of the desired modality. true means streaming, false means relational.

Specified by:

supportsModality in interface SqlValidatorNamespace

Overrides:

supportsModality in class AbstractNamespace

Parameters:

modality - Modality

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

Overrides:

getMonotonicity in class AbstractNamespace