Bug 137130 The cascading parameter does not work when a column name includes double quotation marks
Description: The cascading parameter does not work when a column name includes double quotation marks Steps to reproduce: 1. download the report design file 2. change the flat file path to the related position 3. save and preview. Actual result: The cascading parameter can not retrieve the data.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryResults.java
* If current query results is associated with a sub query, its result
	 * iterator needs to know which group level this sub query belongs to.
	 * 
	 * @return group level of sub query
	 */
	int getGroupLevel( )
	{
		return queryService.getGroupLevel( );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryService#isClosed()
	 */
	public boolean isClosed( )
	{
		return queryService == null;
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryService#getNestedLevel()
	 */
	public int getNestedLevel( )
	{
		return this.nestedLevel;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryService#getQueryScope()
	 */
	public Scriptable getQueryScope( )
	{