[HIVE-18006] Optimize memory footprint of HLLDenseRegister

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 3.0.0
• Target Version/s: 3.0.0
• Assignee: Prasanth Jayachandran
• Reporter: Prasanth Jayachandran
• Created: 07/Nov/17 21:33
• Updated: 22/May/18 23:14
• Resolved: 08/Nov/17 10:29

Description

private double[] invPow2Register;

seems to add up memory when caching column stats (#table * #partition * #cols). This register can be pre-computed and stored as constant.