text: -- @testpoint: lengthb函数入参为字符类型
  drop table if exists t_nvl_rca_tab;
  create table t_nvl_rca_tab( 
  COL_1 CHARACTER(4));
  insert into t_nvl_rca_tab values('rise');
  select distinct LENGTHB(COL_1) from t_nvl_rca_tab;
  drop table t_nvl_rca_tab;