Bug 142939 Invalid interval will cause incorrect group action.
Description: Invalid interval will cause incorrect group action. Steps to reproduce: 1. Insert a list 2. Add a group, key is string type column, set interval to year, range to 3 3. Preview Expected result: Error msg about invald interval and ignore the invalid interval. Actual result: No error msg and only return one group with all datarows.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
{
	private IBaseQueryDefinition baseQueryDefn;
	private AggregateTable aggrTable;
	private AggregateCalculator aggregates;
	
	private Scriptable sharedScope;
	
	
	private Scriptable parentScope;
	
	private Scriptable queryScope;