Create statistical UDFs.
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Key: HIVE-607
URL: https://issues.apache.org/jira/browse/HIVE-607
Project: Hadoop Hive
Issue Type: New Feature
Components: Query Processor
Reporter: S. Alex Smith
Priority: Minor
Create UDFs replicating:
STD() Return the population standard deviation
STDDEV_POP()(v5.0.3) Return the population standard deviation
STDDEV_SAMP()(v5.0.3) Return the sample standard deviation
STDDEV() Return the population standard deviation
SUM() Return the sum
VAR_POP()(v5.0.3) Return the population standard variance
VAR_SAMP()(v5.0.3) Return the sample variance
VARIANCE()(v4.1) Return the population standard variance
as found at http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html.
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