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Posted to issues@arrow.apache.org by "Ben Kietzman (Jira)" <ji...@apache.org> on 2021/01/27 17:21:00 UTC

[jira] [Created] (ARROW-11402) [C++][Dataset] Allow more aggresive implicit casts for literals

Ben Kietzman created ARROW-11402:
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             Summary: [C++][Dataset] Allow more aggresive implicit casts for literals
                 Key: ARROW-11402
                 URL: https://issues.apache.org/jira/browse/ARROW-11402
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Ben Kietzman
            Assignee: Ben Kietzman
             Fix For: 4.0.0


After ARROW-8919, a literal in an Expression may cause unnecessary implicit casting of a column. For example {{equal(field_ref("i8"), literal(1))}} will cause column i8 to be promoted to the type of the literal (int32) for comparison. Since we have access to the literal value at bind time we could examine {{1}} and determine that it can safely be *de*moted to int8, which produces a semantically equivalent and more performant filter.





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