New algorithm for variance() UDAF
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Key: HIVE-1372
URL: https://issues.apache.org/jira/browse/HIVE-1372
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Affects Versions: 0.6.0
Reporter: Mayank Lahiri
Priority: Minor
Fix For: 0.6.0
A new algorithm for the UDAF that computes variance. This is pretty much a
drop-in replacement for the current UDAF, and has two benefits: provably
numerically stable (reference included in comments), and reduces arithmetic
operations by about half.
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