question: private void doReverseKNN ( RdKNNNode node , DBID oid , ModifiableDoubleDBIDList result ) { if ( node . isLeaf ( ) ) { for ( int i = 0 ; i < node . getNumEntries ( ) ; i ++ ) { RdKNNLeafEntry entry = ( RdKNNLeafEntry ) node . getEntry ( i ) ; double distance = distanceQuery . distance ( entry . getDBID ( ) , oid ) ; if ( distance <= entry . getKnnDistance ( ) ) { result . add ( distance , entry . getDBID ( ) ) ; } } } else { for ( int i = 0 ; i < node . getNumEntries ( ) ; i ++ ) { RdKNNDirectoryEntry entry = ( RdKNNDirectoryEntry ) node . getEntry ( i ) ; double minDist = distanceQuery . minDist ( entry , oid ) ; if ( minDist <= entry . getKnnDistance ( ) ) { doReverseKNN ( getNode ( entry ) , oid , result ) ; } } } }
target:  Performs a reverse knn query in the specified subtree.