Bug 135474 [Smoke]Data in computed columns can't be read
Details: Data in computed columns can't be read Step: 1. New a datasource and dataset 2. Add a computed columns and input some wore in Expression. 3. Drop the table into layout and preview. Actual result: The column of computed columns only preview undefined.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/NativeRowObject.java
{
		if ( !rsets.isEmpty( ) )
		{
			IResultSet rset = (IResultSet) rsets.getFirst( );
			try
			{
				IResultMetaData metaData = rset.getResultMetaData( );
				Object[] names = new Object[metaData.getColumnCount( )];
				for ( int i = 0; i < names.length; i++ )
				{
					names[i] = metaData.getColumnName( i );
				}
				return names;
			}
			catch ( BirtException ex )
			{
			}
		}
		return null;
	}
	public Object getDefaultValue( Class hint )
	{
		return null;
	}
	public boolean hasInstance( Scriptable instance )
	{
		return false;
	}
}