org.eigenbase.sql.validate
Class CollectNamespace

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

All Implemented Interfaces:

SqlValidatorNamespace

public class CollectNamespace
extends AbstractNamespace

Namespace for COLLECT and TABLE constructs.

Examples:

• SELECT deptno, COLLECT(empno) FROM emp GROUP BY deptno,
• SELECT * FROM (TABLE getEmpsInDept(30)).

NOTE: jhyde, 2006/4/24: These days, this class seems to be used exclusively for the MULTISET construct.

Since:

Mar 25, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/CollectNamespace.java#11 $

Author:

wael

See Also:

CollectScope

Field Summary

private SqlCall	child
private SqlValidatorScope	scope

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

enclosingNode, rowType, validator

Constructor Summary

CollectNamespace(SqlCall child, SqlValidatorScope scope, SqlNode enclosingNode)
Creates a CollectNamespace.

Method Summary

SqlNode	getNode() Returns the parse tree node at the root of this namespace.
SqlValidatorScope	getScope()
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

child

private final SqlCall child

scope

private final SqlValidatorScope scope

Constructor Detail

CollectNamespace

CollectNamespace(SqlCall child,
                 SqlValidatorScope scope,
                 SqlNode enclosingNode)

Creates a CollectNamespace.

Parameters:

child - Parse tree node

scope - Scope

enclosingNode - Enclosing parse tree node

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

getScope

public SqlValidatorScope getScope()