[jira] [Created] (DRILL-5459) Extend physical operator test framework to test mini plans consisting of multiple operators

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

Jinfeng Ni created DRILL-5459:
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             Summary: Extend physical operator test framework to test mini plans consisting of multiple operators
                 Key: DRILL-5459
                 URL: https://issues.apache.org/jira/browse/DRILL-5459
             Project: Apache Drill
          Issue Type: Improvement
          Components: Tools, Build & Test
            Reporter: Jinfeng Ni


DRILL-4437 introduced a unit test framework to test a non-scan physical operator. A JSON reader is implicitly used to specify the inputs to the physical operator under test. 

There are needs to extend such unit test framework for two scenarios.

1. We need a way to test scan operator with different record readers. Drill supports a variety of data source, and it's important to make sure every record reader work properly according to the protocol defined.

2. We need a way to test a so-called mini-plan (aka plan fragment) consisting of multiple non-scan operators. 

For the 2nd need, an alternative is to leverage SQL statement and query planner. However, such approach has a direct dependency on query planner; 1) any planner change may impact the testcase and lead to a different plan, 2) it's not always easy job to force the planner to get a desired plan fragment for testing.

In particular, it would be good to have a relatively easy way to specify a mini-plan with a couple of targeted physical operators. 

This JIRA is created to track the work to extend the unit test framework in DRILL-4437.
    



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