dosubot[bot] commented on issue #41795:
URL: https://github.com/apache/superset/issues/41795#issuecomment-4891249368

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   Thanks for the detailed bug report! I was able to confirm the root cause you 
identified and trace it through the full stack.
   
   **Root Cause:** UUID columns are mapped to `GenericDataType.STRING` in the 
backend 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/db_engine_specs/clickhouse.py#L85-L88),
 which causes the frontend to classify them with `sortType === 'alphanumeric'` 
[[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/plugins/plugin-chart-table/src/TableChart.tsx#L110-L118)
 and include them in the searchable columns dropdown. When a search is 
executed, the backend applies an ILIKE filter — but critically, the 
cast-to-string logic in `helpers.py` only applies to columns that are **not** 
already `GenericDataType.STRING` 
[[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset/models/helpers.py#L1888-L1898):
   
   ```python
   elif op in {
       utils.FilterOperator.ILIKE.value,
       utils.FilterOperator.LIKE.value,
   }:
       if target_generic_type != GenericDataType.STRING:
           sqla_col = sa.cast(sqla_col, sa.String)
   ```
   
   Since UUID columns are already tagged as STRING, the cast is skipped and the 
raw ILIKE hits the native UUID column type, which PostgreSQL and ClickHouse 
reject.
   
   **Potential fixes (in order of scope):**
   
   1. **Backend — force cast for UUID column types** in the ILIKE handler: 
detect the actual SQLAlchemy column type (e.g., `UUID`, `GUID`) and apply 
`sa.cast(sqla_col, sa.String)` even when `target_generic_type == STRING`. This 
is the most surgical fix.
   
   2. **Frontend — exclude UUID columns from the search dropdown** by passing 
the actual column type (not just `GenericDataType`) to the filter logic in 
`TableChart.tsx`, preventing the search attempt entirely.
   
   3. **Introduce `GenericDataType.UUID`** — a more comprehensive approach that 
would let both frontend and backend handle UUIDs distinctly from plain strings.
   
   I didn't find any existing issues or PRs tracking this specific UUID + ILIKE 
+ server pagination combination, so this appears to be a new report. A prior PR 
did add similar cast-handling for non-string scalars in the BaseDAO ILIKE 
operator [[4]](https://github.com/apache/superset/pull/41653), which could 
serve as a reference for the fix pattern.
   
   
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