[GitHub] [arrow-datafusion] mustafasrepo opened a new issue, #4403: Add support for NTILE built-in Window Function

[GitBox <gi...@apache.org>]

mustafasrepo opened a new issue, #4403:
URL: https://github.com/apache/arrow-datafusion/issues/4403

   
   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   Currently, there is no support for `NTILE` queries. When we run the query below
   
   ```sql
   SELECT
   NTILE(10) OVER (ORDER BY C12) as ntile1,
   NTILE(20) OVER (ORDER BY C12 DESC) as ntile2
   FROM aggregate_test_100
   ORDER BY C9
   LIMIT 5
   ```
   
   we get the error `called Result::unwrap() on an Err value: "Plan(\"Coercion from [Int64] to the signature Exact([UInt64]) failed.\")` . I want support for queries involving `NTILE`.
   
   **Describe the solution you'd like**
   
   We should add an implementation for `NTILE` function first then, we should select the implementation during built-in window function creation in the [link](https://github.com/apache/arrow-datafusion/blob/fe8aee6730e503fd898ade2bef92791fe61411a4/datafusion/core/src/physical_plan/windows/mod.rs#L97). (For NTILE we will get not yet implemented error.). NTILE implementation can be done by extending ROW_NUMBER implementation in the [link](https://github.com/apache/arrow-datafusion/blob/master/datafusion/physical-expr/src/window/row_number.rs)
   
   **Describe alternatives you've considered**
   
   N.A
   
   **Additional context**
   
   It seems that (the error above indicates) there is also an issue during the parsing of the `NTILE` argument, hence the addition of `NTILE` functionality may require changing some other codes.


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[GitHub] [arrow-datafusion] alamb closed issue #4403: Add support for NTILE built-in Window Function

[GitBox <gi...@apache.org>]

alamb closed issue #4403: Add support for NTILE built-in Window Function
URL: https://github.com/apache/arrow-datafusion/issues/4403


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