.. 
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    pgRouting Manual
    Copyright(c) pgRouting Contributors

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Description of the return values
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Returns set of ``(start_vid, end_vid, agg_cost)``

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Column        Type          Description
============= ============= =================================================
**start_vid** ``BIGINT``    Identifier of the starting vertex.
**end_vid**   ``BIGINT``    Identifier of the ending vertex.
**agg_cost**  ``FLOAT``     Aggregate cost of the shortest path from ``start_vid`` to ``end_vid``.
============= ============= =================================================

