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 IDataSourceInstanceHandle getDataSourceInstanceHandle( )
	{
		return this.dataSource;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getJSAggrValueObject()
	 */
	public Scriptable getJSAggrValueObject( )
	{
		if ( aggregates != null )
			return aggregates.getJSAggrValueObject( );
		else
			return null;
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getNestedDataSets(int)
	 */
	public DataSetRuntime[] getNestedDataSets( int nestedCount )
	{
		return outerResults.getDataSetRuntime( nestedCount );
	}
	/*
	 * @see org.eclipse.birt.data.engine.impl.IQueryExecutor#getOdiResultSet()
	 */
	public IResultIterator getOdiResultSet( )
	{
		return this.odiResult;
	}
}