presto-main/src/main/java/io/prestosql/sql/analyzer/FeaturesConfig.java/FeaturesConfig/setDictionaryAggregation
class FeaturesConfig:    @Config("optimizer.dictionary-aggregation")
    public FeaturesConfig setDictionaryAggregation(boolean dictionaryAggregation)
    {
        this.dictionaryAggregation = dictionaryAggregation;
        return this;
    }