4paradigm / 4paradigm/OpenMLDB
window project over limit clause is not supported
- Dominant language
- C++
- Stars
- 1.7k
- Forks
- 331
- Avg merge
- 12d 12h
- Merged PRs (30d)
- 1
Description
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 (....)
```
Contributor guide
Research direction
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.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp, sql
- Domain
- databases, machine-learning
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100