org.eigenbase.sql.validate
Class SelectNamespace

java.lang.Object
  org.eigenbase.sql.validate.AbstractNamespace
      org.eigenbase.sql.validate.SelectNamespace

All Implemented Interfaces:

SqlValidatorNamespace

public class SelectNamespace
extends AbstractNamespace

Namespace offered by a subquery.

Since:

Mar 25, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/SelectNamespace.java#15 $

Author:

jhyde

See Also:

SelectScope, SetopNamespace

Field Summary

private SqlSelect

select

Fields inherited from class org.eigenbase.sql.validate.AbstractNamespace

enclosingNode, rowType, validator

Constructor Summary

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

Method Summary

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.
RelDataType	validateImpl() Validates this scope and returns the type of the records it returns.

Methods inherited from class org.eigenbase.sql.validate.AbstractNamespace

fieldExists, getEnclosingNode, getMonotonicExprs, getRowType, getRowTypeSansSystemColumns, getTable, getValidator, isWrapperFor, lookupChild, makeNullable, setRowType, 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

validateImpl

public RelDataType validateImpl()

Description copied from class: AbstractNamespace

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

Specified by:

validateImpl in class AbstractNamespace

Returns:

record data type, never null

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