Github user orhankislal commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/78#discussion_r92063547
--- Diff: src/ports/postgres/modules/graph/sssp.py_in ---
@@ -0,0 +1,347 @@
+# coding=utf-8
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Single Source Shortest Path
+
+# Please refer to the sssp.sql_in file for the documentation
+
+"""
+@file sssp.py_in
+
+@namespace graph
+"""
+
+import plpy
+from utilities.control import MinWarning
+from utilities.utilities import _assert
+from utilities.utilities import extract_keyvalue_params
+from utilities.utilities import unique_string
+from utilities.validate_args import get_cols
+from utilities.validate_args import unquote_ident
+from utilities.validate_args import table_exists
+from utilities.validate_args import columns_exist_in_table
+from utilities.validate_args import table_is_empty
+
+m4_changequote(`<!', `!>')
+
+def graph_sssp(schema_madlib, vertex_table, vertex_id, edge_table,
+ edge_args, source_vertex, out_table, **kwargs):
+ """
+ Single source shortest path function for graphs
+ Args:
+ @param vertex_table Name of the table that contains the vertex
data.
+ @param vertex_id Name of the column containing the vertex
ids.
+ @param edge_table Name of the table that contains the edge
data.
+ @param edge_args A comma-delimited string containing
multiple
+ named arguments of the
form "name=value".
+ @param source_vertex The source vertex id for the algorithm to
start.
+ @param out_table Name of the table to store the
result of SSSP.
+ """
+
+ with MinWarning("warning"):
+
+ INT_MAX = 2147483647
+
+ message = unique_string(desp='message')
+ toupdate = unique_string(desp='toupdate')
+
+ params_types = {'src': str, 'dest': str, 'weight': str}
+ default_args = {'src': 'src', 'dest': 'dest', 'weight':
'weight'}
+ edge_params = extract_keyvalue_params(edge_args,
+ params_types,
+ default_args)
+ if vertex_id is None:
+ vertex_id = "id"
+
+ src = edge_params["src"]
+ dest = edge_params["dest"]
+ weight = edge_params["weight"]
+
+ distribution = m4_ifdef(<!__POSTGRESQL__!>, <!''!>,
+ <!"DISTRIBUTED BY ({0})".format(vertex_id)!>)
+ local_distribution = m4_ifdef(<!__POSTGRESQL__!>, <!''!>,
+ <!"DISTRIBUTED BY (id)"!>)
+
+ validate_graph_coding(vertex_table, vertex_id, edge_table,
+ edge_params, source_vertex, out_table)
+
+ plpy.execute(" DROP TABLE IF EXISTS
{0},{1}".format(message,toupdate))
--- End diff --
`message` and `toupdate` are not user inputs. They are created locally at
line 63-64.
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