Bug 187201 DTE should give out 4 API for CrossTab sort and filter
DTE should give out 4 API for CrossTab sort and filter. 2 apis are used by giving out the available binding for CrossTab sort and filter. The third is api used by giving out the member value viewer is available. The fourth api is used by giving out the available value list about the memeber value.
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/api/DataRequestSession.java
* which can be subsequently executed to produce query results.
	 */
	public abstract IBasePreparedQuery prepare( IDataQueryDefinition query,
			Map appContext ) throws AdapterException;
	/**
	 * Execute a base prepared query, return an IBaseQueryResults instance which
	 * can in turn be used to get Result Iterator or Cube cursor.
	 */
	public abstract IBaseQueryResults execute( IBasePreparedQuery query,
			IBaseQueryResults outerResults, Scriptable scope )
			throws AdapterException;
	/**
	 * Retrieves all distinct values of a data set column based on searchInfo
	 * and return in a Collection.
	 * 
	 * @param dataSet
	 *            Handle of data set to query
	 * @param inputParamBindings
	 *            An iterator of ParamBindingHandle objects that defines
	 *            bindings for the data set's input parameters
	 * @param columnBindings
	 *            An iterator of ComputedColumnHandle objects that define all
	 *            column binding expressions
	 * @param boundColumnName
	 *            Name of the bound column to retrieve values for
	 * @param requestInfo
	 *            Information on result set retrieving(like start index,return
	 *            row number...)
	 * @return
	 * @throws BirtException