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Posted to jira@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2020/12/30 22:16:00 UTC

[jira] [Created] (ARROW-11080) [C++][Dataset] Improvements to implicit casting

Neal Richardson created ARROW-11080:
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             Summary: [C++][Dataset] Improvements to implicit casting
                 Key: ARROW-11080
                 URL: https://issues.apache.org/jira/browse/ARROW-11080
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Neal Richardson
            Assignee: Ben Kietzman
             Fix For: 3.0.0


Followup to ARROW-10322. In ARROW-9187, where we started making use of more compute functions in R, we found a couple of places where implicit casts weren't being inserted where they should:

* https://github.com/apache/arrow/pull/8947/commits/843ff2a39d8a4e1c92247fb672567c0b85b4f45a#diff-79100695986bbd6a63704fe9f238ce3ae9a39ddd093b7f6b213d4a722309d20aR576 "Function multiply_checked has no kernel matching input types (scalar[double], array[int32])"
* https://github.com/apache/arrow/pull/8947/commits/843ff2a39d8a4e1c92247fb672567c0b85b4f45a#diff-79100695986bbd6a63704fe9f238ce3ae9a39ddd093b7f6b213d4a722309d20aR590  "Function add_checked has no kernel matching input types (array[double], array[int32])" because implicit casts are only applied to scalars to cast them to the type of the other argument

This may speak to a need for more rules around how inputs should be casted/promoted in different contexts.



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