## Proposed changes
Issue Number: close #xxx
For the latest published 2.1 version `2.1.5`:
```
max_be_exec_version=4;
AGG_FUNCTION_NEW=2;
```
and `branch-2.1`:
```
max_be_exec_version=5;
AGG_FUNCTION_NEW=2;
```
It will cause problem when upgrading.
This PR fix the problem, set `AGG_FUNCTION_NEW` to `5`.