From 9878c1bc9fc8fae5a88d2d97f0d67060b830c007 Mon Sep 17 00:00:00 2001
From: Sonia Zorba <sonia.zorba@inaf.it>
Date: Mon, 31 May 2021 08:07:32 +0200
Subject: [PATCH] Added id_from_vos_path() function. Performs much better than
joining node_vos_path view
---
03-other-functions.sql | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/03-other-functions.sql b/03-other-functions.sql
index 2cc0048..5d46df3 100644
--- a/03-other-functions.sql
+++ b/03-other-functions.sql
@@ -17,3 +17,20 @@ SELECT array_agg(elements) FROM (
$func$ LANGUAGE sql;
SELECT update_array('{"group1","group2"}'::VARCHAR[],'{"group2","group3"}'::VARCHAR[],'{"group1"}'::VARCHAR[]) = '{"group2","group3"}' AS test_passed;
+
+-- Returns node_id of a given vos_path. Setting cost to 1 tells the planner to always execute this function before other clauses (100 is the default function cost).
+
+CREATE OR REPLACE FUNCTION id_from_vos_path(vos_path_input VARCHAR) RETURNS BIGINT IMMUTABLE COST 1 AS
+$func$
+WITH RECURSIVE r_vos_path AS (
+ SELECT node_id, path, 1 AS level, STRING_TO_ARRAY(vos_path_input, '/') AS parts, (CASE WHEN vos_path_input = '/' THEN '/' ELSE '' END) AS vos_path
+ FROM node
+ WHERE name = ''
+ UNION ALL
+ SELECT n.node_id, n.path, p.level + 1, p.parts, p.vos_path || '/' || p.parts[p.level + 1]
+ FROM node n
+ JOIN r_vos_path p ON p.path = n.parent_path
+ WHERE n.name = p.parts[p.level + 1]
+)
+SELECT node_id FROM r_vos_path WHERE vos_path = vos_path_input
+$func$ LANGUAGE sql;
--
GitLab