[jira] [Assigned] (ARROW-10173) [Rust][DataFusion] Improve performance of equality to a constant predicate support

["Andy Grove (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove reassigned ARROW-10173:
----------------------------------

    Assignee: Yordan Pavlov

> [Rust][DataFusion] Improve performance of equality to a constant predicate support
> ----------------------------------------------------------------------------------
>
>                 Key: ARROW-10173
>                 URL: https://issues.apache.org/jira/browse/ARROW-10173
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust, Rust - DataFusion
>            Reporter: Andrew Lamb
>            Assignee: Yordan Pavlov
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.0.0
>
>          Time Spent: 5.5h
>  Remaining Estimate: 0h
>
> I noticed this behavior while working on support for DictionaryArrays and wanted to capture it in a ticket in case someone has time to work on it. 
> In order to implement an equality predicate to a constant such as {{d1 = 'three'}}, DataFusion effectively creates an array with the same value {{'three'}} repeated over and over again and uses the equality compute kernel. This is ... suboptimal.
> Here is what the predicate looks like:
> {code}
>         predicate: BinaryExpr {
>             left: CastExpr {
>                 expr: Column {
>                     name: "d1",
>                 },
>                 cast_type: Utf8,
>             },
>             op: Eq,
>             right: Literal {
>                 value: Utf8("three"),
>             },
>         },
> {code}



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