[HIVE-14437] Vectorization: Optimize key misses in VectorMapJoinFastBytesHashTable

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.2.0
• Component/s: Vectorization

Release Note

 Vectorization: Optimize key misses in VectorMapJoinFastBytesHashTable (Gopal V, reviewed by Matt McCline)

• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 05/Aug/16 11:58
• Updated: 26/Jul/17 03:29
• Resolved: 26/Aug/16 04:20

Description

Currently, the lookup in VectorMapJoinFastBytesHashTable proceeds until the max number of metric put conflicts have been reached.

This can have a fast-exit when encountering the first empty slot during the probe, to speed up looking for non-existent keys.