[jira] [Updated] (ARROW-9654) [Rust][DataFusion] Add an EXPLAIN command to the datafusion CLI

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

     [ https://issues.apache.org/jira/browse/ARROW-9654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Grove updated ARROW-9654:
------------------------------
    Component/s: Rust - DataFusion
                 Rust

> [Rust][DataFusion] Add an EXPLAIN command to the datafusion CLI
> ---------------------------------------------------------------
>
>                 Key: ARROW-9654
>                 URL: https://issues.apache.org/jira/browse/ARROW-9654
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Rust, Rust - DataFusion
>            Reporter: Andrew Lamb
>            Priority: Major
>
> In order to understand what DataFusion's planner is doing, it would be helpful to have an "EXPLAIN PLAN" feature. All other database systems I have worked with have such a feature (e.g. see [MySql|https://dev.mysql.com/doc/refman/8.0/en/explain-output.html]). 
> I have found EXPLAIN helpful for both users but also very much developers.
> The feature would look something like
> {code}
> EXPLAIN <sql>
> {code}
> Which would then print a string with the logical plan. One way to implement this would simply be to use the debugging printout of the logical and physical plans



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