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
* @param columnName
	 * @return
	 */
	private boolean isTempColumn( String columnName )
	{
		if ( columnName.length( ) < 7 )
		{
			return false;
		}
		if ( !columnName.matches( TEMP_COLUMN_STRING ) )
		{
			return false;
		}
		return true;
	}
	/**
	 * Populate the JointResultMetadata.
	 * 
	 * @param left
	 * @param leftPrefix
	 * @param right
	 * @param rightPrefix
	 * @return
	 * @throws DataException
	 */
	private JointResultMetadata populatorJointResultMetadata(
			IResultMetaData left, String leftPrefix, IResultMetaData right,
			String rightPrefix ) throws DataException
	{
		try