[HIVE-16533] Vectorization: Avoid evaluating empty groupby keys

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.1, 3.0.0
• Fix Version/s: 3.0.0
• Component/s: Vectorization
• Target Version/s: 3.0.0
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 25/Apr/17 20:37
• Updated: 22/May/18 23:59
• Resolved: 27/Apr/17 03:10

Description

VectorHashKeyWrapperBatch::evaluateBatch() dirties the L1 cache and slows down simple count/sum/min/max queries.

Everything done inside that function is a no-op after HIVE-16182