Github user rashmi815 commented on the issue:
https://github.com/apache/incubator-madlib/pull/136
Ran a test with the following data set and found that the get_path function
outputs two paths for the example I tried (tests were run using a Greenplum
database 4.3.12 VM on local machine). See below:
```sql
drop table if exists vertex_disc, edge_disc;
create table vertex_disc (id integer) distributed by (id);
create table edge_disc (src int, dest int, weight float8) distributed
randomly;
insert into vertex_disc VALUES
(0),
(1),
(2),
(3),
(4),
(5),
(6),
(7),
(8),
(9),
(10)
;
insert into edge_disc VALUES
(0, 5, 1),
(1, 0, 1),
(1, 3, 1),
(2, 6, 1),
(3, 4, 1),
(3, 5, 1),
(4, 2, 1),
(8, 9, 1),
(10, 8, 1)
;
drop table if exists out_disc, out_disc_summary;
SELECT madlib.graph_apsp('vertex_disc',NULL,'edge_disc',NULL,'out_disc');
SELECT * FROM out_disc_summary;
SELECT * FROM out_disc ORDER BY src,dest;
select madlib.graph_apsp_get_path('out_disc',1,5,'out_disc_path');
select * from out_disc_path;
path
---------
{1,3,5}
{1,0,5}
(2 rows)
```
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