compute table keys once

Author: NeOzay

script/vm/type.lua

@@ -327,7 +327,7 @@ function vm.isSubType(uri, child, parent, mark, errs)
             local weakNil = config.get(uri, 'Lua.type.weakNilCheck')
             local skipTable
             for n in child:eachObject() do
-                if skipTable == nil and n.type == "table" and parent.type == "vm.node" then -- skip table type check if child is has class
+                if skipTable == nil and n.type == "table" and parent.type == "vm.node" then -- skip table type check if child has class
                     ---@cast parent vm.node
                     for _, c in ipairs(child) do
                         if c.type == 'global' and c.cate == 'type' then
@@ -486,19 +486,20 @@ function vm.isSubType(uri, child, parent, mark, errs)
         local set = parent:getSets(uri)
         local missedKeys = {}
         local failedCheck
-
-        local myKeys = {}
-        for _, field in ipairs(child) do
-            local key = vm.getKeyName(field) or field.tindex
-            if key then
-                myKeys[key] = vm.compileNode(field)
-            end
-        end
-        
+        local myKeys
         for _, def in ipairs(set) do
             if not def.fields or #def.fields == 0 then
                 goto continue
             end
+            if not myKeys then
+                myKeys = {}
+                for _, field in ipairs(child) do
+                    local key = vm.getKeyName(field) or field.tindex
+                    if key then
+                        myKeys[key] = vm.compileNode(field)
+                    end
+                end
+            end
 
             for _, field in ipairs(def.fields) do
                 local key = vm.getKeyName(field)
@@ -512,6 +513,7 @@ function vm.isSubType(uri, child, parent, mark, errs)
                 if not key then
                     goto continue
                 end
+
                 local ok
                 local nodeField = vm.compileNode(field)
                 if myKeys[key] then