[DRILL-2209] Save on CPU cycles by adding Project with column that has hash calculated

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Component/s: Execution - Flow, Query Planning & Optimization
• Assignee: Yuliya Feldman
• Reporter: Yuliya Feldman
• Created: 11/Feb/15 07:13
• Updated: 09/Mar/15 17:40
• Resolved: 09/Mar/15 17:40

Description

Related to DRILL-133. Wrapping HashToRandomExhcnage and/or LocalExchange with Project operator with additional column that represents hash function of column(s) we are hashing on. This is to save CPU cycles and not recalculate hash every time