**Is this a BUG REPORT or FEATURE REQUEST?**:
> - feature
**What happened**:
在 1.1 和 2.0 版本中,我可以通过添加 support_extended_features=on 来卸载我们自定义的扩展,但是在 2.1 的版本中,添加这个 GUC 参数也无法卸载扩展。
**What you expected to happen**:
可以自己删除扩展
**How to reproduce it (as minimally and precisely as possible)**:
**Anything else we need to know?**:
**Environment**:
- Version:
- OS (e.g. from /etc/os-release):
- Kernel (e.g. `uname -a`):
- Install tools:
- Others: