org.eigenbase.sql.validate
Class JoinNamespace

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

All Implemented Interfaces:

SqlValidatorNamespace

 class JoinNamespace
extends AbstractNamespace

Namespace representing the row type produced by joining two relations.

Since:

Mar 25, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/JoinNamespace.java#10 $

Author:

jhyde

Field Summary

private SqlJoin

join

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

enclosingNode, rowType, validator

Constructor Summary

JoinNamespace(SqlValidatorImpl validator, SqlJoin join)

Method Summary

SqlNode	getNode() Returns the parse tree node at the root of this namespace.
protected 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, getMonotonicity, 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

join

private final SqlJoin join

Constructor Detail

JoinNamespace

JoinNamespace(SqlValidatorImpl validator,
              SqlJoin join)

Method Detail

validateImpl

protected 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

getNode

public SqlNode getNode()

Description copied from interface: SqlValidatorNamespace

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

Returns:

parse tree node