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https://issues.apache.org/jira/browse/ARROW-11402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman updated ARROW-11402:
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Fix Version/s: (was: 4.0.0)
5.0.0
> [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
> Priority: Major
> Labels: dataset
> Fix For: 5.0.0
>
>
> 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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