Bug 192332 Engine does not set values for parameters in a data extraction task
Engine does not set values for parameters in a data extraction task. So if a query binds a paramter, we can not get correct data from document.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTaskV1.java
/**
	 * report document contains the data
	 */
	protected IReportDocument reportDocReader;
	/**
	 * report design in the report document.
	 */
	protected Report report;
	/**
	 * selected instance id
	 */
	protected InstanceID instanceId;
	/**
	 * selected rest set
	 */
	protected String resultSetName;
	/**
	 * selected columns
	 */
	protected String[] selectedColumns;
	/**
	 * current extaction results
	 */
	protected IExtractionResults currentResult = null;
	/**
	 * simple filter expression
	 */
	protected IFilterDefinition[] filterExpressions = null;
	/**
	 * have the metadata be prepared. meta data means rsetName2IdMapping and