[jira] [Assigned] (ARROW-11928) [C++][Compute] Add ExecNode hierarchy

["Ben Kietzman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-11928?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ben Kietzman reassigned ARROW-11928:
------------------------------------

    Assignee: Ben Kietzman  (was: Antoine Pitrou)

> [C++][Compute] Add ExecNode hierarchy
> -------------------------------------
>
>                 Key: ARROW-11928
>                 URL: https://issues.apache.org/jira/browse/ARROW-11928
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 3.0.0
>            Reporter: Ben Kietzman
>            Assignee: Ben Kietzman
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 5h 40m
>  Remaining Estimate: 0h
>
> Per discussion on https://docs.google.com/document/d/1AyTdLU-RxA-Gsb9EsYnrQrmqPMOYMfPlWwxRi1Is1tQ
> Add an ExecNode interface with which a streaming execution graph can be constructed. Initial concrete classes will include:
> - ScanNode, which wraps a dataset and is a pure emitter of batches (initially, this will only wrap memory sized datasets such as tables. See ARROW-11930)
> - FilterNode, which evaluates an expression on inputs and based on the result removes rows from batches (eventually, this may defer materialization of the selection to other kernels. See ARROW-5005 ARROW-10474)
> - ProjectNode, which evaluates expressions on inputs producing new columns.
> - GroupedAggregateNode, which computes aggregations grouped on one or more keys.



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