Dijkstra crashes if a cost is negative

[antonpa]

According to the documentation :

• cost: double precision value of the edge traversal cost. (a negative cost
  will prevent the edge from being inserted in the graph).

Yet when I have a negative cost (-1) to forbid using an edge it seems to crash (I don't know what really happens :

testdb=# SELECT * FROM shortest_path('SELECT edge_id AS id, source_id::int4 as source, target_id::int4 as target, cost::double precision AS cost FROM streets_topology',18342, 49625, false, false);
server closed the connection unexpectedly

This probably means the server terminated abnormally
before or while processing the request.

The connection to the server was lost. Attempting reset: Failed.
If I set the cost to a high value, or 'Infinity' it works correctly.

I suppose that the algorithm considers that the edge exists and has a negative cost (which is a problem with Dijkstra).

[woodbri]

SHA: 561c7e7 fixes this issue in branch sew-devel-2_0