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/api/querydefn/BaseTransform.java
{
    
    /**
     * The expression is evaluated before the first row in the series. A constant for the 
     * expressionTiming parameter of addExpression.  
     */
    public static final int BEFORE_FIRST_ROW  	= 0;
    /**