[DRILL-1220] Process the 'star' columns appropriately in Project operator based on new plans

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Assignee: DrillCommitter
• Reporter: Aman Sinha
• Created: 29/Jul/14 21:40
• Updated: 31/Jul/14 06:32
• Resolved: 30/Jul/14 05:32

Description

For queries that involve '*' (star) in the SELECT list, the Drill plan has to perform special handling of such columns since it must distinguish columns coming from both sides of a join. Recent planner enhancements add prefixes at the appropriate intermediate Project nodes and remove it at the top level Project.

The Project execution operator must be enhanced in order to correctly process such 'annotated' Project expressions that are handed by the plan. This issue tracks this enhancement.