durgaprasadml opened a new pull request, #42248:
URL: https://github.com/apache/superset/pull/42248
## Description
```markdown
### SUMMARY
Fixes the server pagination page-size selector when the configured **Server
Page Length** is greater than the total number of rows.
Previously, the configured page size was filtered out whenever it exceeded
the result row count. As a consequence, the selector could incorrectly fall
back to `0`, display invalid page-size options, and prevent users from
switching back to the configured page size without refreshing the page.
This change:
- Preserves the configured server page size even when it exceeds the current
row count.
- Prevents the page-size selector from falling back to an invalid `0` value
when no exact match exists.
- Selects the nearest valid page-size option if the configured value is
unavailable.
- Adds a regression test covering the scenario where `serverPageLength >
rowCount`.
Fixes #42243
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
N/A
### TESTING INSTRUCTIONS
1. Create a standard **Table** chart.
2. Set **Row limit** to `10000`.
3. Enable **Server pagination**.
4. Set **Server Page Length** to `20`.
5. Use a dataset returning **12 rows**.
6. Verify that:
- The page-size selector initially displays **20**.
- The dropdown contains **10** and **20**.
- The dropdown does **not** contain **0**.
7. Change the page size to **10**.
8. Verify that **20** remains available and can be selected again.
9. Verify that server pagination behaves normally for datasets where the row
count is greater than the configured page size.
### ADDITIONAL INFORMATION
- [x] Has associated issue: Fixes #42243
- [ ] Required feature flags
- [x] Changes UI
- [ ] Includes DB Migration
- [ ] Introduces new feature or API
- [ ] Removes existing feature or API
```
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