codeant-ai-for-open-source[bot] commented on PR #38174:
URL: https://github.com/apache/superset/pull/38174#issuecomment-3942537563
## **Sequence Diagram**
Shows how the table metadata endpoint detects ODPS partitioned tables,
constructs a Partition object, and routes metadata/preview generation to
OdpsEngineSpec which injects a partition filter into the SELECT used for
preview.
```mermaid
sequenceDiagram
participant Client as SQLLab/UI
participant API as Databases API (table_metadata)
participant DAO as DatabaseDAO.is_odps_partitioned_table
participant Engine as OdpsEngineSpec
participant DB as Database (sqla / pyodps)
Client->>API: GET /table_metadata?name=table...
API->>DAO: is_odps_partitioned_table(database, table_name)
DAO-->>API: (is_partitioned=True, partition_fields=["p1",...])
API->>Engine: get_table_metadata(database, table, Partition(...))
Engine->>DB: get columns/metadata & select_star(...)
Engine->>DB: select_star includes partition WHERE for ODPS partitioned
table
DB-->>Engine: table metadata + selectStar SQL
Engine-->>API: TableMetadataResponse (with partition-aware selectStar)
API-->>Client: 200 OK (table metadata and preview SQL)
```
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