org.eigenbase.sql.validate
Class AggFinder

java.lang.Object
  org.eigenbase.sql.util.SqlBasicVisitor<Void>
      org.eigenbase.sql.validate.AggFinder

All Implemented Interfaces:

SqlVisitor<Void>

 class AggFinder
extends SqlBasicVisitor<Void>

Visitor which looks for an aggregate function inside a tree of SqlNode objects.

Since:

Oct 28, 2004

Version:

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

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

private boolean

over

Constructor Summary

AggFinder(boolean over)
Creates an AggFinder.

Method Summary

SqlNode	findAgg(SqlNode node) Finds an aggregate.
Void	visit(SqlCall call) Visits a call to a SqlOperator.

Methods inherited from class org.eigenbase.sql.util.SqlBasicVisitor

visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

over

private final boolean over

Constructor Detail

AggFinder

AggFinder(boolean over)

Creates an AggFinder.

Parameters:

over - Whether to find windowed function calls Agg(x) OVER windowSpec

Method Detail

findAgg

public SqlNode findAgg(SqlNode node)

Finds an aggregate.

Parameters:

node - Parse tree to search

Returns:

First aggregate function in parse tree, or null if not found

visit

public Void visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<Void>

Overrides:

visit in class SqlBasicVisitor<Void>

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)