box: remove unicode_ci for functions

Unicode_ci collation breaks the general
rule for objects naming, so we remove it
in version 2.3.1

Closes #4561

src/box/lua/upgrade.lua

@@ -942,6 +942,19 @@ local function upgrade_to_2_3_0()
     _ck_constraint:format(format)
 end
 
+--------------------------------------------------------------------------------
+-- Tarantool 2.3.1
+--------------------------------------------------------------------------------
+
+local function drop_func_collation()
+    local _func = box.space[box.schema.FUNC_ID]
+    _func.index.name:alter({parts = {{'name', 'string'}}})
+end
+
+local function upgrade_to_2_3_1()
+    drop_func_collation()
+end
+
 --------------------------------------------------------------------------------
 
 local function get_version()
@@ -977,6 +990,7 @@ local function upgrade(options)
         {version = mkversion(2, 1, 3), func = upgrade_to_2_1_3, auto = true},
         {version = mkversion(2, 2, 1), func = upgrade_to_2_2_1, auto = true},
         {version = mkversion(2, 3, 0), func = upgrade_to_2_3_0, auto = true},
+        {version = mkversion(2, 3, 1), func = upgrade_to_2_3_1, auto = true},
     }
 
     for _, handler in ipairs(handlers) do

test/box-py/bootstrap.result

@@ -4,7 +4,7 @@ box.internal.bootstrap()
 box.space._schema:select{}
 ---
 - - ['max_id', 511]
-  - ['version', 2, 3, 0]
+  - ['version', 2, 3, 1]
 ...
 box.space._cluster:select{}
 ---
@@ -123,7 +123,7 @@ box.space._index:select{}
   - [289, 2, 'name', 'tree', {'unique': true}, [[0, 'unsigned'], [2, 'string']]]
   - [296, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [296, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
-  - [296, 2, 'name', 'tree', {'unique': true}, [{'field': 2, 'collation': 2, 'type': 'string'}]]
+  - [296, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]
   - [297, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [297, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
   - [297, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]

test/box/alter.result

@@ -190,7 +190,7 @@ _index:select{}
   - [289, 2, 'name', 'tree', {'unique': true}, [[0, 'unsigned'], [2, 'string']]]
   - [296, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [296, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
-  - [296, 2, 'name', 'tree', {'unique': true}, [{'field': 2, 'collation': 2, 'type': 'string'}]]
+  - [296, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]
   - [297, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned']]]
   - [297, 1, 'owner', 'tree', {'unique': false}, [[1, 'unsigned']]]
   - [297, 2, 'name', 'tree', {'unique': true}, [[2, 'string']]]