MT#56693 fix 15766.up improve parent_chain aggregation

* use char based aggregation instead of JSON_ARRAY accumulation +
  REPLACE

Change-Id: I5deb748637d2becc6d5aa6f598ba5a858b09b74b

db_scripts/diff/15766.up

@@ -54,7 +54,7 @@ BEGIN
         WITH RECURSIVE cte as (
                 SELECT v.id AS set_id, v.handle_id,
                        v.id AS data_set_id,
-                       JSON_ARRAY(v.id) AS parent_chain
+                       CAST('' AS CHAR(4096)) AS parent_chain
                   FROM (SELECT s.*, h.id as handle_id
                         FROM (voip_sound_sets s, voip_sound_handles h)
                        ) AS v
@@ -77,18 +77,16 @@ BEGIN
             UNION
             SELECT v.id AS set_id, v.handle_id,
                    IF(f.use_parent = 0, v.id, cte.data_set_id) AS data_set_id,
-                   JSON_ARRAY_INSERT(cte.parent_chain, "$[0]", v.id) AS parent_chain
+                   CONCAT(v.parent_id, IF(cte.parent_chain, ':', ''), cte.parent_chain) as parent_chain
               FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
                     FROM (voip_sound_sets s, voip_sound_handles h)
                    ) AS v
               LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
               JOIN cte ON cte.set_id = v.parent_id AND cte.handle_id = v.handle_id
         )
-        SELECT set_id, handle_id, IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
-               REPLACE(REPLACE(REPLACE(
-                JSON_REMOVE(cte.parent_chain, "$[0]"),
-                "[", ""), "]", ""), ", ", ":"
-               ) AS parent_chain
+        SELECT set_id, handle_id,
+               IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
+               parent_chain
           FROM cte;
     ELSE
         IF u_handle_id IS NOT NULL THEN
@@ -101,7 +99,7 @@ BEGIN
         WITH RECURSIVE cte as (
                 SELECT v.id AS set_id, v.handle_id,
                        v.id AS data_set_id,
-                       JSON_ARRAY(v.id) AS parent_chain
+                       CAST('' AS CHAR(4096)) AS parent_chain
                   FROM (SELECT s.*, h.id as handle_id
                         FROM (voip_sound_sets s, voip_sound_handles h)
                        ) AS v
@@ -111,18 +109,16 @@ BEGIN
                  UNION
                 SELECT v.id AS set_id, v.handle_id,
                        IF(f.use_parent = 0, v.id, cte.data_set_id) AS data_set_id,
-                       JSON_ARRAY_INSERT(cte.parent_chain, "$[0]", v.id) AS parent_chain
+                       CONCAT(v.parent_id, IF(cte.parent_chain, ':', ''), cte.parent_chain) as parent_chain
                   FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
                         FROM (voip_sound_sets s, voip_sound_handles h)
                        ) AS v
                   LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
                   JOIN cte ON cte.set_id = v.parent_id AND cte.handle_id = v.handle_id
         )
-        SELECT set_id, handle_id, IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
-               REPLACE(REPLACE(REPLACE(
-                JSON_REMOVE(cte.parent_chain, "$[0]"),
-                "[", ""), "]", ""), ", ", ":"
-               ) AS parent_chain
+        SELECT set_id, handle_id,
+               IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
+               parent_chain
           FROM cte;
     END IF;