[KYLIN-1623] Make the hll precision for data samping configurable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: v1.5.2
• Component/s: Job Engine
• Assignee: Shao Feng Shi
• Reporter: Shao Feng Shi
• Created: 26/Apr/16 10:42
• Updated: 26/May/16 09:16
• Resolved: 11/May/16 06:22

Description

now kylin uses hll(14) for sampling; it should be configurable at cube level for small or large cubes. Property name "kylin.job.cubing.inmem.sampling.hll.precision", default be 14; allowed values: 10, 12, 14, 16