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/*PGR-GNU*****************************************************************
File: degree.sql
Copyright (c) 2022 ~ Celia Virginia Vergara Castillo
mail: vicky at georepublic.de
------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
********************************************************************PGR-GNU*/
--v3.4
CREATE FUNCTION pgr_degree(
TEXT, -- Edges SQL
TEXT, -- Vertices SQL
dryrun BOOLEAN DEFAULT false,
OUT node BIGINT,
OUT degree BIGINT
)
RETURNS SETOF RECORD AS
$BODY$
DECLARE
edges_sql TEXT;
vertices_sql TEXT;
has_in_edges BOOLEAN := TRUE;
has_out_edges BOOLEAN := TRUE;
eids TEXT;
query TEXT;
BEGIN
edges_sql := _pgr_checkQuery($1);
PERFORM _pgr_checkColumn(edges_sql, 'id', 'ANY-INTEGER', dryrun => $3);
vertices_sql := _pgr_checkQuery($2);
PERFORM _pgr_checkColumn(vertices_sql, 'id', 'ANY-INTEGER', dryrun => $3);
has_in_edges := _pgr_checkColumn(vertices_sql, 'in_edges', 'ANY-INTEGER[]', true, dryrun => $3);
has_out_edges := _pgr_checkColumn(vertices_sql, 'out_edges', 'ANY-INTEGER[]', true, dryrun => $3);
IF has_in_edges THEN
eids = $$coalesce(in_edges::BIGINT[], '{}'::BIGINT[])$$;
END IF;
IF has_out_edges THEN
IF has_in_edges THEN
eids = E'\n ' || eids
|| E'\n ||\n '
|| $$coalesce(out_edges::BIGINT[], '{}'::BIGINT[])$$;
ELSE
eids = $$coalesce(out_edges::BIGINT[], '{}'::BIGINT[])$$;
END IF;
ELSE
IF NOT has_in_edges THEN
RAISE EXCEPTION 'Missing column'
USING HINT = 'Column "in_edges" and/or "out_edges" is missing in'||E'\n'||vertices_sql;
END IF;
END IF;
query := format($q$
WITH
-- a sub set of edges of the graph goes here
g_edges AS (
$q$ || edges_sql || $q$
),
-- sub set of vertices of the graph goes here
all_vertices AS (
$q$ || vertices_sql || $q$
),
g_vertices AS (
SELECT id,
unnest(%s) AS eid
FROM all_vertices
),
totals AS (
SELECT v.id, count(*)
FROM g_vertices AS v
JOIN g_edges AS e ON (e.id = eid) GROUP BY v.id
)
SELECT id::BIGINT, coalesce(count, 0)::BIGINT FROM all_vertices LEFT JOIN totals USING (id)
$q$, eids);
IF dryrun THEN
RAISE NOTICE '%', query || ';';
ELSE
RETURN QUERY EXECUTE query;
END IF;
EXCEPTION WHEN OTHERS THEN
RAISE EXCEPTION '%', SQLERRM
USING HINT = 'Please check query: '|| $1;
END;
$BODY$
LANGUAGE plpgsql VOLATILE STRICT;
-- COMMENTS
COMMENT ON FUNCTION pgr_degree(TEXT, TEXT, BOOLEAN)
IS 'pgr_degree
- PROPOSED
- Parameters
- Edges SQL with columns: id
- Vertices SQL with columns: id, in_edges, out_edges
- Documentation:
- ${PROJECT_DOC_LINK}/pgr_degree.html
';
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