Bug 146548 [regression]Data type convert in chart data binding doesn't work.
Description: Data type convert in chart data binding doesn't work. Steps to reproduce: 1. New sample data source and dataset from OFFICES. 2. Insert a chart, bind it to dataset 3. Edit data binding to change officecode from string type to integer type 4. Drag officecode to y-series Expected result: No errors. Actual result: Unable to use a text data to render a numerical/datetime axis. org.eclipse.birt.chart.exception.ChartException at: org.eclipse.birt.chart.factory.Generator.build(Generator.java:985) org.eclipse.birt.chart.ui.swt.wizard.internal.ChartPreviewPainter.updateBuffer(ChartPreviewPainter.java:152) org.eclipse.birt.chart.ui.swt.wizard.internal.ChartPreviewPainter.renderModel(ChartPreviewPainter.java:333) org.eclipse.birt.chart.ui.swt.wizard.TaskSelectData.doLivePreview(TaskSelectData.java:1043) org.eclipse.birt.chart.ui.swt.wizard.TaskSelectData.changeTask(TaskSelectData.java:984) org.eclipse.birt.chart.ui.swt.wizard.ChartAdapter.notifyChanged(ChartAdapter.java:68) org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/expression/ExprEvaluateUtil.java
* 
	 * @param dataExpr
	 * @param scope
	 * @return the value of raw data type, Java or Java Script
	 * @throws BirtException
	 */
	public static Object evaluateRawExpression( IBaseExpression dataExpr,
			Scriptable scope ) throws BirtException
	{
		return doEvaluateRawExpression( dataExpr, scope, false );
	}
	
	/**
	 * @param dataExpr
	 * @param scope
	 * @return the value of Java data type
	 * @throws BirtException
	 */
	public static Object evaluateRawExpression2( IBaseExpression dataExpr,
			Scriptable scope ) throws BirtException
	{
		return doEvaluateRawExpression( dataExpr, scope, true );
	}
	
	/**
	 * @param dataExpr
	 * @param scope
	 * @return
	 * @throws BirtException
	 */