gongxun0928 opened a new pull request, #763:
URL: https://github.com/apache/cloudberry/pull/763
### What does this PR do?
Add a registration-based method to support extensions to implement custom
smgr
To implement custom smgr based on the registration-based method, the
following modifications need to be made
Firstly we should to define our own f_smgr structure in extension.
`struct f_smgr custom_smgr = {
.smgr_name = "custom smgr",
.smgr_name = = md_init,
...
}`
Then register our own structure in shared_preload_libraries phase.
`smgr_register(&custom_smgr, CUSTOM_SMGR_ID);`
CUSTOM_SMGR_ID should be unique and cannot be changed, and should
not conflict with other extensions.
Finally we need to correctly return the relation's smgr id in smgr_get_impl
### Type of Change
- [ ] Bug fix (non-breaking change)
- [x] New feature (non-breaking change)
- [ ] Breaking change (fix or feature with breaking changes)
- [ ] Documentation update
### Test Plan
<!-- How did you test these changes? -->
- [ ] Unit tests added/updated
- [ ] Integration tests added/updated
- [ ] Passed `make installcheck`
- [ ] Passed `make -C src/test installcheck-cbdb-parallel`
### Impact
<!-- Remove sections that don't apply -->
**Performance:**
<!-- Any performance implications? -->
**User-facing changes:**
<!-- Any changes visible to users? -->
**Dependencies:**
<!-- New dependencies or version changes? -->
### Checklist
- [ ] Followed [contribution
guide](https://cloudberry.apache.org/contribute/code)
- [ ] Added/updated documentation
- [ ] Reviewed code for security implications
- [ ] Requested review from [cloudberry
committers](https://github.com/orgs/apache/teams/cloudberry-committers)
### Additional Context
<!-- Any other information that would help reviewers? Remove if none -->
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