Bug 126390 IDataSetInstance needs method to return column information
There is no way to get the Java equivalent of the JavaScript columnDefns array, which describes the columns in a data set.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/script/internal/instance/DataSetInstance.java
private IDataSetInstanceHandle dataSet;
	public DataSetInstance( IDataSetInstanceHandle dataSet )
	{
		this.dataSet = dataSet;
	}
	public String getName( )
	{
		return dataSet.getName( );
	}
	public IDataSourceInstance getDataSource( )
	{
		return new DataSourceInstance( dataSet.getDataSource( ) );
	}
	public String getExtensionID( )
	{
		return dataSet.getExtensionID( );
	}
	public String getQueryText( ) throws ScriptException
	{
		try
		{
			return dataSet.getQueryText( );
		} catch ( BirtException e )
		{
			throw new ScriptException( e.getLocalizedMessage( ) );
		}
	}
	public void setQueryText( String queryText ) throws ScriptException
	{
		try