Github user iyerr3 commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/154#discussion_r129796954
--- Diff: src/ports/postgres/modules/graph/apsp.py_in ---
@@ -72,22 +73,25 @@ def graph_apsp(schema_madlib, vertex_table, vertex_id,
edge_table,
edge_params = extract_keyvalue_params(edge_args, params_types,
default_args)
# Prepare the input for recording in the summary table
- if vertex_id is None:
+ if (vertex_id is None) or (vertex_id == ''):
v_st = "NULL"
vertex_id = "id"
else:
v_st = vertex_id
- if edge_args is None:
+
+ if (edge_args is None) or (edge_args == ''):
--- End diff --
`if not edge_args`
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