Github user fmcquillan99 commented on the issue:
https://github.com/apache/madlib/pull/315
re-running the failed test, seems to pass now:
```
SELECT * FROM knn_result_list_neighbors ORDER BY id;
```
produces
```
id | data | k_nearest_neighbours
----+---------+----------------------
1 | {2,1} | {1,2,3}
2 | {2,6} | {5,4,3}
3 | {15,40} | {7,6,5}
4 | {12,1} | {4,5,3}
5 | {2,90} | {9,6,7}
6 | {50,45} | {6,7,8}
(6 rows)
```
LGTM---
