[DRILL-3108] Replace templated returns with covariant return overrides

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 1.1.0
• Component/s: Execution - Data Types
• Assignee: Hanifi Gunes
• Reporter: Hanifi Gunes
• Created: 15/May/15 20:36
• Updated: 01/Jul/15 01:01
• Resolved: 29/May/15 02:46

Description

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.