nevzheng opened a new issue, #12072:
URL: https://github.com/apache/gravitino/issues/12072

   ### Describe the subtask
   
   Complete and document the five-family compatibility contract for OceanBase 
CE 4.2.1 in MySQL mode.
   
   **Compatibility outcomes**
   
   - **Nanosecond timestamps:** Reject precision above 6.
   - **Variant:** Reject because OceanBase JSON is a narrower contract.
   - **Unknown/Null:** Reject.
   - **Geometry:** Reject because current reload loses CRS and SRID.
   - **Geography:** Reject because OceanBase has no faithful geography 
semantics.
   
   **Acceptance**
   
   - Reproduce all five families through the connector's public 
create/conversion path and its alter/load paths where supported.
   - A supported mapping must round-trip without losing type identity or 
parameters.
   - An unsupported mapping must return `IllegalArgumentException` before 
external metadata mutation; no fallback to a narrower or opaque type is allowed.
   - Cover nested types where the connector supports complex columns.
   - Add focused converter/operation tests and an integration or no-side-effect 
test appropriate to the connector.
   - Update the connector documentation with a five-family compatibility matrix 
and rejection rationale.
   - Keep implementation commits atomic by connector and type family.
   
   **Connector-specific verification**
   
   Reproduce all five creates against Docker OceanBase and verify each rejects 
and leaves no table. Cover converter, SQL-generation, module, and formatting 
checks.
   
   **Documentation**
   
   `docs/jdbc-oceanbase-catalog.md`
   
   ### Parent issue
   
   #12056


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