LP#1768141 - Mark permission.grp_descendants STABLE.

Quoting Galen Charlton's comments on the bug report:

The database function permission.grp_descendants should
be marked stable; it qualifies, and doing so should allow
PostgreSQL to improve query plans. One example of a query
that would benefit is searching by patron profile (a la
bug 1497322)

Signed-off-by: Chris Sharp <csharp@georgialibraries.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Signed-off-by: Jason Boyer <jboyer@equinoxinitiative.org>

diff --git a/Open-ILS/src/sql/Pg/006.schema.permissions.sql b/Open-ILS/src/sql/Pg/006.schema.permissions.sql
index 564f785..05d38a6 100644 (file)
--- a/Open-ILS/src/sql/Pg/006.schema.permissions.sql
+++ b/Open-ILS/src/sql/Pg/006.schema.permissions.sql
@@ -133,7 +133,7 @@ CREATE OR REPLACE FUNCTION permission.grp_descendants( INT ) RETURNS SETOF permi
           FROM  permission.grp_tree gr
                 JOIN descendant_depth dd ON (dd.id = gr.parent)
     ) SELECT gr.* FROM permission.grp_tree gr JOIN descendant_depth USING (id);
-$$ LANGUAGE SQL ROWS 1;
+$$ LANGUAGE SQL STABLE ROWS 1;
 
 CREATE OR REPLACE FUNCTION permission.grp_tree_full_path ( INT ) RETURNS SETOF permission.grp_tree AS $$
         SELECT  *

diff --git a/Open-ILS/src/sql/Pg/upgrade/XXXX.schema.mark_perm_grp_descendants_stable.sql b/Open-ILS/src/sql/Pg/upgrade/XXXX.schema.mark_perm_grp_descendants_stable.sql
new file mode 100644 (file)
index 0000000..3524433
--- /dev/null
+++ b/Open-ILS/src/sql/Pg/upgrade/XXXX.schema.mark_perm_grp_descendants_stable.sql
@@ -0,0 +1,19 @@
+BEGIN;
+
+SELECT evergreen.upgrade_deps_block_check('XXXX', :eg_version);
+
+CREATE OR REPLACE FUNCTION permission.grp_descendants( INT ) RETURNS SETOF permission.grp_tree AS $$
+    WITH RECURSIVE descendant_depth AS (
+        SELECT  gr.id,
+                gr.parent
+          FROM  permission.grp_tree gr
+          WHERE gr.id = $1
+            UNION ALL
+        SELECT  gr.id,
+                gr.parent
+          FROM  permission.grp_tree gr
+                JOIN descendant_depth dd ON (dd.id = gr.parent)
+    ) SELECT gr.* FROM permission.grp_tree gr JOIN descendant_depth USING (id);
+$$ LANGUAGE SQL STABLE ROWS 1;
+
+COMMIT;