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
}
			initialize( dataEngine, appContext );
			JointResultMetadata jrm = getJointResultMetadata( left.getResultMetaData( ),
					right.getResultMetaData( ) );
			resultClass = jrm.getResultClass( );
			populator = JointDataSetPopulatorFactory.getBinaryTreeDataSetPopulator( left.getOdiResult( ),
					right.getOdiResult( ),
					jrm,
					matcher,
					joinType, dataEngine.getSession( ),
					dataSetDesign.getRowFetchLimit( ));
			if ( doesSaveToCache( ) == false )
				return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						populator,
						eventHandler, dataEngine.getSession( ) );
			else
				return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						new DataSetResultCache( populator, resultClass, dataEngine.getSession( ) ),
						eventHandler, dataEngine.getSession( ) );
		}
		/**
		 * @param obs
		 * @return
		 */
		private List toList( Object[] obs )
		{
			if ( obs == null )
				return null;