Module aggregation 

Aggregation Framework

Provides aggregation functions for query results.

Supported Functions

• COUNT: Count rows (including COUNT(*) and COUNT DISTINCT)
• SUM: Sum numeric values
• AVG: Average of numeric values
• MIN: Minimum value
• MAX: Maximum value
• STDDEV: Standard deviation
• VARIANCE: Statistical variance
• PERCENTILE: Nth percentile value

GROUP BY

Aggregations can be grouped by one or more columns. HAVING clause filters groups after aggregation.

Structs

AggregationDef

Definition of an aggregation to compute

AvgAggregator

AVG aggregator

CountAggregator

COUNT aggregator

CountDistinctAggregator

COUNT DISTINCT aggregator

GroupConcatAggregator

GROUP_CONCAT aggregator

MaxAggregator

MAX aggregator

MinAggregator

MIN aggregator

PercentileAggregator

Percentile aggregator

SampleAggregator

SAMPLE aggregator (returns first non-null value)

StdDevAggregator

Standard deviation aggregator

SumAggregator

SUM aggregator

VarianceAggregator

Variance aggregator

Traits

Aggregator

Trait for aggregation functions

Functions

create_aggregator

Create an aggregator by name

execute_group_by

1-pass streaming GROUP BY.

execute_having

Execute HAVING clause (filter on aggregated results)