Bug 137464 apply a filter on a Join dataset in chart editor's select data page, the data preview part is not refresh
Description: use the attach file.When apply a filter on a Join dataaset in chart editor's select data page, the data preview part is not refresh. Step to reproduce: 1. open the attach file 2. creat a chart and choose select data page 3. use the Jiondataset and set the X Y series 4. chilck a filter with row["Data Set1::EMPLOYEEID"] =1 Actual result: look at the data preview after you apply the filter,you will find it haven't change any more but the filter has effect Ecepted result: the data preview should refresh after set a filter
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedJointDataSourceQuery.java
return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						populator,
						eventHandler );
			else
				return new CachedResultSet( (BaseQuery) this.odiQuery,
						resultClass,
						new DataSetResultCache( populator, resultClass ),
						eventHandler );
		}
		
		/**
		 * @return
		 */
		private boolean doesLoadFromCache( )
		{
			return DataSetCacheManager.getInstance( ).doesLoadFromCache( );
		}
		
		/**
		 * @return
		 */
		private boolean doesSaveToCache( )
		{
			return DataSetCacheManager.getInstance( ).doesSaveToCache( );
		}
	}
	
}