presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setMaxPartialAggregationMemoryUsage
class TaskManagerConfig:    @Config("task.max-partial-aggregation-memory")
    public TaskManagerConfig setMaxPartialAggregationMemoryUsage(DataSize maxPartialAggregationMemoryUsage)
    {
        this.maxPartialAggregationMemoryUsage = maxPartialAggregationMemoryUsage;
        return this;
    }