[jira] [Created] (DRILL-5325) Implement sub-opertor unit tests for managed external sort

["Paul Rogers (JIRA)" <ji...@apache.org>]

Paul Rogers created DRILL-5325:
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             Summary: Implement sub-opertor unit tests for managed external sort
                 Key: DRILL-5325
                 URL: https://issues.apache.org/jira/browse/DRILL-5325
             Project: Apache Drill
          Issue Type: Sub-task
    Affects Versions: 1.11.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers
             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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