org.eigenbase.sql.validate
Class SetopNamespace

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

All Implemented Interfaces:

SqlValidatorNamespace

public class SetopNamespace
extends AbstractNamespace

Namespace based upon a set operation (UNION, INTERSECT, EXCEPT).

Since:

Mar 25, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/SetopNamespace.java#13 $

Author:

jhyde

Field Summary

private SqlCall

call

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

enclosingNode, rowType, validator

Constructor Summary

protected

SetopNamespace(SqlValidatorImpl validator, SqlCall call, SqlNode enclosingNode) Creates a SetopNamespace.

Method Summary

SqlNode	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, 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

call

private final SqlCall call

Constructor Detail

SetopNamespace

protected SetopNamespace(SqlValidatorImpl validator,
                         SqlCall call,
                         SqlNode enclosingNode)

Creates a SetopNamespace.

Parameters:

validator - Validator

call - Call to set operator

enclosingNode - Enclosing node

Method Detail

getNode

public SqlNode 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