Bug 189534 Computed Column aggregation builder doesn't accept argument.
The aggregation builder of computed column should be enhanced so that 1. It can accept aggregation argument. 2. Only when the selected computed column can accept argument should the argument dialog enabled.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/internal/adapter/ComputedColumnAdapter.java
/*
 *************************************************************************
 * Copyright (c) 2006 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *  
 *************************************************************************
 */ 
package org.eclipse.birt.report.data.adapter.internal.adapter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.birt.data.engine.api.querydefn.ComputedColumn;
import org.eclipse.birt.data.engine.api.querydefn.ScriptExpression;
import org.eclipse.birt.report.data.adapter.api.AdapterException;
import org.eclipse.birt.report.model.api.AggregationArgumentHandle;
import org.eclipse.birt.report.model.api.ComputedColumnHandle;
/**
 * Adapts a Model computed column
 */
public class ComputedColumnAdapter extends ComputedColumn