Bug 179737 The MeasureHandle should be able to provide data type info
We are now allow user input expression as measure expression. However this brings difficulties in determine the data type of a measure expression evaluation result. We need MeasureHandle to be enhanced to include the data type info. Please note that data type "any" is not accepted.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/olap/MeasureHandle.java
}
	/**
	 * Sets the function for this measure.
	 * 
	 * @param function
	 *            the function to set
	 * @throws SemanticException
	 *             property is locked or value is invalid
	 */
	public void setFunction( String function ) throws SemanticException
	{
		setStringProperty( FUNCTION_PROP, function );
	}
	/**
	 * Gets the measure expression of this measure element.
	 * 
	 * @return measure expression of this measure element
	 */
	public String getMeasureExpression( )
	{
		return getStringProperty( MEASURE_EXPRESSION_PROP );
	}
	/**
	 * Sets the measure expression for this measure.
	 * 
	 * @param expression
	 *            the measure expression to set
	 * @throws SemanticException
	 *             property is locked
	 */