Bug 131011 Support running query based on report document data
Data Engine should support running a query based on data set and expression data stored in a report document. This bugzilla entry serves as a repository for design docs and notes related to this feature.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
* @see org.eclipse.birt.data.engine.api.IResultIterator#getString(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public String getString( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toString( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBigDecimal(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public BigDecimal getBigDecimal( IBaseExpression dataExpr )
			throws BirtException
	{
		return DataTypeUtil.toBigDecimal( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getDate(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public Date getDate( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toDate( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBlob(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public Blob getBlob( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toBlob( getValue( dataExpr ) );
	}
	/*
	 * (non-Javadoc)