Bug 189706 Enhance computed column aggregation function handling in UI.
Due to the issue discussed in 189705, current computed column aggregation builder in data set editor has bugs to extend: 1.When new a computed column, the aggregation argument field cannot be correctly set. 2.The argument field cannot be correct grayed out when user select a aggregation function without arguments 3.The available aggregation function list is incomprehensive 4.Some aggregation function cannot be set to model(say, weightedAve).
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/ExpressionProcessor.java
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	IScriptExpression getScriptExpression( )
	{
		return this.scriptExpr;
	}
	/**
	 * 
	 * @return
	 */
	int getExprType( )
	{
		return this.exprType;
	}
	/**
	 * 
	 * @return
	 */
	int getCurrentGroupLevel( )
	{
		return this.currentGroupLevel;
	}
	/**
	 * 
	 * @return
	 */
	boolean useCustomerChecked( )
	{
		return this.customerChecked;
	}
}