Bug 191627 [Regression]Exception occurs when first preview the joint dataset[0706]
Description: [Regression]Exception occurs when preview the flatfile and sampledb joint dataset[0706] Build number: 2.2.0.v20070608-0630 Steps to reproduce: 1, New a flatfile dataset 2, New a CUSTOMER dataset 3, Join two datasets with STATE column 4, Preview in dataset Expected result: Preview successfully Actual result: Exception occurs Error log: A BIRT exception occurred. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Data Engine Plug-in ID:org.eclipse.birt.data Version:2.2.0.v20070607-1421 Error Code:data.engine.ColumnBindingReferToInexistColumn Error Message:Column binding "Employee::CUSTOMERNUMBER" has referred to a data set column "Employee::CUSTOMERNUMBER" which is not exist.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedJointDataSourceQuery.java
private void setCurrentDataSet( IBaseDataSetDesign dataSetDesign )
	{
		dataSet = (IJointDataSetDesign) dataSetDesign;
	}
	/**
	 * Return an instance of JointResultMeta.
	 * 
	 * @param left
	 * @param right
	 * @return
	 * @throws DataException
	 */
	private JointResultMetadata getJointResultMetadata( IResultMetaData left,
			IResultMetaData right ) throws DataException
	{
		
		if ( left == null || right == null )
		{
			throw new DataException( ResourceConstants.UNEXPECTED_ERROR );
		}
		try
		{
			String leftPrefix = getDataSetName(dataSet.getLeftDataSetDesignName( ));
			String rightPrefix = getDataSetName(dataSet.getRightDataSetDesignName( ));
			if ( leftPrefix.equals( rightPrefix ) )
			{
				leftPrefix = leftPrefix + "1";
				rightPrefix = rightPrefix + "2";
			}
			leftPrefix = leftPrefix + COLUMN_NAME_SPLITTER;