TT#147151 UDFs for fast usage count of billing profile&network

mariadb does not support variable referals in correlated
subqueries if the nesting depth is 2 or beyond.

so in short: below works ->

select
  (select
     count(*)
   from table1
    where id = root.id
  ) as cnt
from table2 as root;

... while this not unfortunately:

select
  (select
     count(1)
   from (select
           1
         from table1
         where id = root.id
         LIMIT 1001) as q
  ) as cnt_limited
from table2 as root;

this can be solved by declaring the topical subqueries
in dedicated user-defined functions, so involved
panel/api parts will load quickly even with millions of
subscribers.

Change-Id: If96603cb4115259d719297af46c5bc7c10aadf76
(cherry picked from commit 52b3341599)

db_scripts/diff/15703.down

@@ -0,0 +1,4 @@
+use billing;
+
+drop function if exists get_billing_profile_contract_cnt;
+drop function if exists get_billing_network_contract_cnt;

db_scripts/diff/15703.up

@@ -0,0 +1,78 @@
+use billing;
+
+delimiter ;;
+drop function if exists get_billing_profile_contract_cnt;;
+create function get_billing_profile_contract_cnt(
+  _profile_id int,
+  _limit int
+) returns int(11)
+deterministic reads sql data
+begin
+
+  if _limit >= 0 then
+    return (select
+        count(1)
+      from (select
+          1
+        from billing.contracts_billing_profile_network_schedule cbpns
+        join billing.contracts_billing_profile_network cbpn on cbpns.profile_network_id = cbpn.id
+        join billing._v_actual_effective_start_time est on est.contract_id = cbpn.contract_id and cbpns.effective_start_time = est.effective_start_time
+        join billing.contracts as c on est.contract_id = c.id
+        where
+        cbpn.billing_profile_id = _profile_id
+        and c.status != 'terminated'
+        limit _limit) as q
+    );
+  end if;
+
+  return (select
+      count(1)
+    from billing.contracts_billing_profile_network_schedule cbpns
+    join billing.contracts_billing_profile_network cbpn on cbpns.profile_network_id = cbpn.id
+    join billing._v_actual_effective_start_time est on est.contract_id = cbpn.contract_id and cbpns.effective_start_time = est.effective_start_time
+    join billing.contracts as c on est.contract_id = c.id
+    where
+    cbpn.billing_profile_id = _profile_id
+    and c.status != 'terminated'
+  );
+
+end;;
+
+drop function if exists get_billing_network_contract_cnt;;
+create function get_billing_network_contract_cnt(
+  _network_id int,
+  _limit int
+) returns int(11)
+deterministic reads sql data
+begin
+
+  if _limit >= 0 then
+    return (select
+        count(1)
+      from (select
+          1
+        from billing.contracts_billing_profile_network_schedule cbpns
+        join billing.contracts_billing_profile_network cbpn on cbpns.profile_network_id = cbpn.id
+        join billing._v_actual_effective_start_time est on est.contract_id = cbpn.contract_id and cbpns.effective_start_time = est.effective_start_time
+        join billing.contracts as c on est.contract_id = c.id
+        where
+        cbpn.billing_network_id = _network_id
+        and c.status != 'terminated'
+        limit _limit) as q
+    );
+  end if;
+
+  return (select
+      count(1)
+    from billing.contracts_billing_profile_network_schedule cbpns
+    join billing.contracts_billing_profile_network cbpn on cbpns.profile_network_id = cbpn.id
+    join billing._v_actual_effective_start_time est on est.contract_id = cbpn.contract_id and cbpns.effective_start_time = est.effective_start_time
+    join billing.contracts as c on est.contract_id = c.id
+    where
+    cbpn.billing_network_id = _network_id
+    and c.status != 'terminated'
+  );
+
+end;;
+
+delimiter ;