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