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Version: Java (Groovy)

AggCount

AggCount returns an aggregator that computes the number of elements within an aggregation group.

Syntax​

AggCount(resultColumn)

Parameters​

ParameterTypeDescription
resultColumnString

The name of the output column that will contain the number of elements in each group.

Returns​

An aggregator that computes the number of elements within an aggregation group, for each group.

Examples​

In this example, AggCount adds a count column, Number, while AggAvg returns the average Number, as grouped by X.

import static io.deephaven.api.agg.Aggregation.AggCount
import static io.deephaven.api.agg.Aggregation.AggAvg

source = newTable(
    stringCol("X", "A", "B", "A", "C", "B", "A", "B", "B", "C"),
    stringCol("Y", "M", "P", "O", "N", "P", "M", "O", "P", "N"),
    intCol("Number", 55, 76, 20, 130, 230, 50, 73, 137, 214),
)

result = source.aggBy([AggCount("Number"),AggAvg("AvgNumber = Number")], "X")