修改PostgreSQL字段长度导致cached plan must not change result type错误
https://chenhuajun.github.io/2020/01/05/%E4%BF%AE%E6%94%B9PostgreSQL%E5%AD%97%E6%AE%B5%E9%95%BF%E5%BA%A6%E5%AF%BC%E8%87%B4cached-plan-must-not-change-result-type%E9%94%99%E8%AF%AF.html
https://chenhuajun.github.io/2020/01/05/%E4%BF%AE%E6%94%B9PostgreSQL%E5%AD%97%E6%AE%B5%E9%95%BF%E5%BA%A6%E5%AF%BC%E8%87%B4cached-plan-must-not-change-result-type%E9%94%99%E8%AF%AF.html
