per-group topk #968
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per-group topk #968
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Implement three versions of the top-k operator that ranks values in the
group and outputs the rank along with the element.
These operators can be used to implement the following SQL pattern:
```sql
SELECT
...,
RANK_FUNCTION() OVER (PARTITION BY .. ORDER BY ...) AS rank
FROM table
WHERE rank <= K
```
where `RANK_FUNCTION` can be one of
- `ROW_NUMBER`
- `RANK`
- `DENSE_RANK`
Signed-off-by: Leonid Ryzhyk <leonid@feldera.com>
Signed-off-by: Mihai Budiu <mbudiu@feldera.com>
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ryzhyk
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ryzhyk
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Nov 2, 2023
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We don't support all of these yet, do we?
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The grammar does, but they are marked in the wishlist as unsupported
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Is this a user-visible change (yes/no): yes
This has been rebased on top of #966, making it unnecessary.