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

["Apache Arrow JIRA Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11402?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Arrow JIRA Bot reassigned ARROW-11402:
---------------------------------------------

    Assignee:     (was: Ben Kietzman)

> [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
>            Priority: Major
>              Labels: dataset
>
> 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.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)