question: protected void recursiveNestedJoin ( EventBean lookupEvent , int nestingOrderIndex , EventBean [ ] currentPath , Collection < EventBean [ ] > result , ExprEvaluatorContext exprEvaluatorContext ) { List < EventBean [ ] > nestedResult = new LinkedList < EventBean [ ] > ( ) ; ExecNode nestedExecNode = childNodes . get ( nestingOrderIndex ) ; nestedExecNode . process ( lookupEvent , currentPath , nestedResult , exprEvaluatorContext ) ; boolean isLastStream = ( nestingOrderIndex == nestingOrderLength - 1 ) ; if ( ! isLastStream ) { for ( EventBean [ ] row : nestedResult ) { EventBean lookup = row [ nestedStreams [ nestingOrderIndex ] ] ; recursiveNestedJoin ( lookup , nestingOrderIndex + 1 , row , result , exprEvaluatorContext ) ; } return ; } for ( EventBean [ ] row : nestedResult ) { result . add ( row ) ; } }
target:  Recursive method to run through all child nodes and, for each result set tuple returned by a child node, execute the inner child of the child node until there are no inner child nodes.