Module stddev 

Defines physical expressions that can evaluated at runtime during query execution

Structs

Stddev

STDDEV and STDDEV_SAMP (standard deviation) aggregate expression

StddevAccumulator

An accumulator to compute the average

StddevGroupsAccumulator

StddevPop

STDDEV_POP population aggregate expression

Functions

stddev

Compute the standard deviation of a set of numbers

stddev_pop

Compute the population standard deviation of a set of numbers

stddev_pop_udaf

AggregateFunction that returns a AggregateUDF for StddevPop

stddev_udaf

AggregateFunction that returns a AggregateUDF for Stddev