Arina Ielchiieva updated DRILL-5325:
    Labels: ready-to-commit  (was: )

> Implement sub-operator unit tests for managed external sort
> -----------------------------------------------------------
>                 Key: DRILL-5325
>                 URL: https://issues.apache.org/jira/browse/DRILL-5325
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Tools, Build & Test
>    Affects Versions: 1.11.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>              Labels: ready-to-commit
>             Fix For: 1.11.0
> Validate the proposed sub-operator test framework, by creating low-level unit 
> tests for the managed version of the external sort.
> The external sort has a small number of existing tests, but those tests are 
> quite superficial; the "managed sort" project found many bugs. The managed 
> sort itself was tested with ad-hoc system-level tests created using the new 
> "cluster fixture" framework. But, again, such tests could not reach deep 
> inside the sort code to exercise very specific conditions.
> As a result, we spent far too much time using QA functional tests to identify 
> specific code issues.
> Using the sub-opeator unit test framework, we can instead test each bit of 
> functionality at the unit test level.
> If doing so works, and is practical, it can serve as a model for other 
> operator testing projects.

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