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datafusion::functions_aggregate::variance - Rust
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datafusion::functions_aggregate

Module variance

Source
Expand description

VarianceSample: variance sample aggregations. VariancePopulation: variance population aggregations.

Structs§

VarianceAccumulator
An accumulator to compute variance The algorithm used is an online implementation and numerically stable. It is based on this paper: Welford, B. P. (1962). “Note on a method for calculating corrected sums of squares and products”. Technometrics. 4 (3): 419–420. doi:10.2307/1266577. JSTOR 1266577.
VarianceGroupsAccumulator
VariancePopulation
VarianceSample

Functions§

var_pop
Computes the population variance.
var_pop_udaf
AggregateFunction that returns a AggregateUDF for VariancePopulation
var_samp_udaf
AggregateFunction that returns a AggregateUDF for VarianceSample
var_sample
Computes the sample variance.