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https://issues.apache.org/jira/browse/DRILL-5423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15993620#comment-15993620
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ASF GitHub Bot commented on DRILL-5423:
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Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/811
Rebased on latest master.
> Refactor ScanBatch to allow unit testing record readers
> -------------------------------------------------------
>
> Key: DRILL-5423
> URL: https://issues.apache.org/jira/browse/DRILL-5423
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.9.0
> Reporter: Paul Rogers
> Assignee: Paul Rogers
> Priority: Minor
> Fix For: 1.11.0
>
>
> A recent set of PRs refactored some of the "context" code to allow easier
> unit testing of operator internals.
> A recent attempt to help a community user revealed that it would be helpful
> to refactor parts of {{ScanBatch}} and {{OperatorContext}} to allow unit
> testing of reader code. In particular:
> * Make {{ScanBatch.Mutator}} into a static class that can be created in a
> unit test separate from a {{ScanBatch}} (and the rest of Drill.)
> * Split {{OperatorContext}} into a execution-only {{OperatorExecContext}}
> interface that can be used in testing. Leave in {{OperatorContext}} the
> methods that require all of Drill to be present.
> Doing the above requires a bit of implementation work:
> * Change {{OperatorContext}} from an abstract class to an interface so that
> it can extend {OperatorExceContext}}.
> * {{OperatorContext}} appears to be a class so that it can hold a static
> method. (Java 8 allows static methods on interfaces, but Drill uses Java 7
> which does not have such support.) Move this method to a new
> {{OperatorUtilities}} class and fix up references.
> * Split the {{OperatorContextImpl}} class into two parts. Move into a new
> {{AbstractOperatorContext}} class the code which implements the low-level
> runtime methods. Leave in the original class the functionality that depends
> on the rest of Drill (such as references to the {{DrillbitContext}}.)
> * Add a method to the new {{OperatorFixture}} class to create a test-time
> version of the {{OperatorExecContext}} interface.
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