[FIX] base: consider materialized view as table

Closes #18442
opw-769167

odoo/models.py

@@ -2589,7 +2589,7 @@ class BaseModel(object):
 
     @api.model_cr
     def _table_exist(self):
-        query = "SELECT relname FROM pg_class WHERE relkind IN ('r','v') AND relname=%s"
+        query = "SELECT relname FROM pg_class WHERE relkind IN ('r','v','m') AND relname=%s"
         self._cr.execute(query, (self._table,))
         return self._cr.rowcount