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/api/script/instance/IDataSetInstance.java
{
	/**
	 * Gets the name of this data set
	 */
	String getName( );
	/**
	 * @return The runtime data source associated with this data set
	 */
	IDataSourceInstance getDataSource( );
	/**
	 * Gets the unique id that identifies the type of the data set, assigned by
	 * the extension providing the implementation of this data set.
	 * 
	 * @return The id fo the type of data set type as referenced by an ODA
	 *         driver. Null if none is defined.
	 */
	String getExtensionID( );
	/**
	 * Gets the query text of the data set.
	 * 
	 * @return The static query text for execution.
	 */
	String getQueryText( ) throws ScriptException;
	/**