gavinchou opened a new pull request, #65053:
URL: https://github.com/apache/doris/pull/65053
### What problem does this PR solve?
When `ALTER TABLE ... MODIFY PARTITION ... SET ("storage_policy" = ...)`
changes an existing partition policy to another policy backed by a different
storage resource, Doris should reject the operation.
Before this patch, the BE tablet meta update was sent before FE checked the
old/new policy resource compatibility. The SQL could fail later in FE, while BE
tablet meta had already persisted the new `storage_policy_id`.
### Check List
- [x] Add a pre-check before updating BE tablet meta.
- [x] Keep same-resource policy switching allowed.
- [x] Add regression coverage for `MODIFY PARTITION (*)` cross-resource
failure.
### Tests
- `git diff --check`
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