4paradigm / 4paradigm/OpenMLDB
window project over limit clause is not supported
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Beschreibung
since fdfd1f29c6b0ed46a822afdd459ea17f567ccd66, window project over limit clause is not supported. Because `LimitTableHandler` is not seekable: https://github.com/4paradigm/OpenMLDB/blob/5ac4667d0e71dc803ddbd04928bc4681b5ba84b6/hybridse/src/vm/catalog_wrapper.h#L444-L448
This kind SQL might not correct.
```sql
select id, count(col) over w from (select * from t1 limit 10) window w as (....)
```
Beitragsleitfaden
Rechercherichtung
The issue points to a specific commit and the LimitTableHandler in hybridse/src/vm/catalog_wrapper.h lines 444-448. First, understand why LimitTableHandler is not seekable and how it affects window functions over a LIMIT clause. Review the SQL example and the surrounding window function implementation. Check test files for window project and limit clause usage to see what 'done' looks like.
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Bewertung
- Tech-Stack
- cpp, sql
- Bereich
- databases, machine-learning
- Issue-Typ
- Bug
- Schwierigkeit
- 4/5
- Geschätzter Aufwand
- 3-5 Tage
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- Veraltet
- Klarheit
- Größtenteils klar
- Anfängerfreundlichkeit
- 35/100