message: Cast raw 'fetch_values_predicate' to Sqlalchemy Text
  Issue
diff: @@ -601,7 +601,7 @@ class SqlaTable(Model, BaseDatasource):
  if self.fetch_values_predicate:
  tp = self.get_template_processor()
  - qry = qry.where(tp.process_template(self.fetch_values_predicate))
  + qry = qry.where(text(tp.process_template(self.fetch_values_predicate)))
  engine = self.database.get_sqla_engine()
  sql = "{}".format(qry.compile(engine, compile_kwargs={"literal_binds": True}))
  