presto-main/src/main/java/io/prestosql/sql/analyzer/FeaturesConfig.java/FeaturesConfig/setPreferPartialAggregation
class FeaturesConfig:    @Config("optimizer.prefer-partial-aggregation")
    public FeaturesConfig setPreferPartialAggregation(boolean value)
    {
        this.preferPartialAggregation = value;
        return this;
    }