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
public DataSetRuntime getDataSet( )
	{
		return dataSet;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getSharedScope()
	 */
	public Scriptable getSharedScope( )
	{
		return this.sharedScope;
	}
	/**
	 * Gets the Javascript scope for evaluating expressions for this query
	 * 
	 * @return
	 */
	public Scriptable getQueryScope( )
	{
		if ( queryScope == null )
		{
			 
			
			
			
			queryScope = newSubScope( parentScope );
			queryScope.setPrototype( dataSet.getJSDataSetObject( ) );
		}
		return queryScope;
	}
	/**