[jira] [Created] (CALCITE-5475) Improve test coverage accuracy by aggregating modules

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

Stamatis Zampetakis created CALCITE-5475:
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             Summary: Improve test coverage accuracy by aggregating modules
                 Key: CALCITE-5475
                 URL: https://issues.apache.org/jira/browse/CALCITE-5475
             Project: Calcite
          Issue Type: Task
            Reporter: Stamatis Zampetakis
            Assignee: Stamatis Zampetakis


Currently the test coverage report is computed per module (using jacocoTestReport task) and upload it to Sonar as is. Considering the modules in isolation leads to some modules have rather low coverage.

+Example+

For testkit module, Sonar reports only 11% coverage at the moment of submitting this ticket:
[https://sonarcloud.io/component_measures?metric=coverage&selected=apache_calcite%3Atestkit%2Fsrc%2Fmain&id=apache_calcite]

Some classes such as [SqlOperatorTest|https://sonarcloud.io/component_measures?metric=coverage&selected=apache_calcite%3Atestkit%2Fsrc%2Fmain%2Fjava%2Forg%2Fapache%2Fcalcite%2Ftest%2FSqlOperatorTest.java&id=apache_calcite] are as low as 1%.

The testkit module does not have itself many tests covering its own classes (under src/main) so if we don't consider how it is used by other modules we get the false impression that it is not sufficiently covered.

The test coverage accuracy can be improved by aggregating the results from all modules together using the [jacoco_report_aggregation_plugin|https://docs.gradle.org/current/userguide/jacoco_report_aggregation_plugin.html#jacoco_report_aggregation_plugin].



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