[jira] [Created] (DRILL-3108) Replace templated returns with covariant return overrides

[Hanifi Gunes (JIRA)]

Hanifi Gunes created DRILL-3108:
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             Summary: Replace templated returns with covariant return overrides
                 Key: DRILL-3108
                 URL: https://issues.apache.org/jira/browse/DRILL-3108
             Project: Apache Drill
          Issue Type: Improvement
          Components: Execution - Data Types
    Affects Versions: 0.9.0
            Reporter: Hanifi Gunes
            Assignee: Hanifi Gunes
            Priority: Minor


Java (≥1.5) supports covariant overrides. We should replace the pattern of 
returning generic types in VVs with covariants return types to avoid verbose 
compile time warnings.



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