Module functions 

Concrete implementations of aggregate functions

Structs

AvgFunction

AVG(column) - averages numeric values

CountFunction

COUNT(column) - counts non-null values

CountStarFunction

COUNT(*) - counts all rows including nulls

MaxFunction

MAX(column) - finds maximum value

MedianFunction

MEDIAN(column) - finds the median value

MinFunction

MIN(column) - finds minimum value

ModeFunction

MODE(column) - finds the most frequently occurring value

PercentileFunction

PERCENTILE(column, percentile) - finds the nth percentile value

StdDevFunction

STDDEV(column) - computes population standard deviation

StdDevPopFunction

STDDEV_POP(column) - computes population standard deviation (same as STDDEV)

StdDevSampFunction

STDDEV_SAMP(column) - computes sample standard deviation

StringAggFunction

STRING_AGG(column, separator) - concatenates strings with separator

SumFunction

SUM(column) - sums numeric values

VarPopFunction

VAR_POP(column) - computes population variance (same as VARIANCE)

VarSampFunction

VAR_SAMP(column) - computes sample variance

VarianceFunction

VARIANCE(column) - computes population variance