[IMP] model: optimize setup_models (#18300)

When setting up models, retrieve all manual fields in a single and specific
query.  This makes the method `_add_manual_fields` 20 times faster.

odoo/addons/base/ir/ir_model.py

@@ -791,6 +791,19 @@ class IrModelFields(models.Model):
                 records = self.browse([fields_data.pop(name)['id'] for name in extra_names])
                 records.with_context(**{MODULE_UNINSTALL_FLAG: True}).unlink()
 
+    @tools.ormcache()
+    def _all_manual_field_data(self):
+        cr = self._cr
+        cr.execute("SELECT * FROM ir_model_fields WHERE state='manual'")
+        result = defaultdict(dict)
+        for row in cr.dictfetchall():
+            result[row['model']][row['name']] = row
+        return result
+
+    def _get_manual_field_data(self, model_name):
+        """ Return the given model's manual field data. """
+        return self._all_manual_field_data().get(model_name, {})
+
     def _instanciate_attrs(self, field_data):
         """ Return the parameters for a field instance for ``field_data``. """
         attrs = {
@@ -819,7 +832,7 @@ class IrModelFields(models.Model):
             if not self.pool.loaded and not (
                 field_data['relation'] in self.env and (
                     field_data['relation_field'] in self.env[field_data['relation']]._fields or
-                    field_data['relation_field'] in self._existing_field_data(field_data['relation'])
+                    field_data['relation_field'] in self._get_manual_field_data(field_data['relation'])
             )):
                 return
             attrs['comodel_name'] = field_data['relation']
@@ -847,7 +860,7 @@ class IrModelFields(models.Model):
 
     def _add_manual_fields(self, model):
         """ Add extra fields on model. """
-        fields_data = self._existing_field_data(model._name)
+        fields_data = self._get_manual_field_data(model._name)
         for name, field_data in fields_data.iteritems():
             if name not in model._fields and field_data['state'] == 'manual':
                 field = self._instanciate(field_data)