Github user njayaram2 commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/113#discussion_r111612309
--- Diff: src/ports/postgres/modules/graph/sssp.py_in ---
@@ -137,45 +226,116 @@ def graph_sssp(schema_madlib, vertex_table,
vertex_id, edge_table,
<!''!>)
plpy.execute(sql_index)
- # The source can be reached with 0 cost and it has itself as
the parent.
- plpy.execute(
- """ INSERT INTO {oldupdate}
- VALUES({source_vertex},0,{source_vertex})
- """.format(**locals()))
+ # The initialization step is quite different when grouping is
involved
+ # since not every group (subgraph) will have the same set of
vertices.
+
+ # Example:
+ # Assume there are two grouping columns g1 and g2
+ # g1 values are 0 and 1. g2 values are 5 and 6
+ if grouping_cols is not None:
+
+ distinct_grp_table = unique_string(desp='grp')
+ plpy.execute(""" DROP TABLE IF EXISTS
{distinct_grp_table} """.
--- End diff --
Some temp tables such as `distinct_grp_table`, `new update`, `old update`
and `temp_table` are not dropped at the end. Not sure if there are other such
tables, please check and drop them.
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