presto-main/src/main/java/io/prestosql/operator/aggregation/multimapagg/SingleMultimapAggregationState.java/SingleMultimapAggregationState/SingleMultimapAggregationState
class SingleMultimapAggregationState:    public SingleMultimapAggregationState(Type keyType, Type valueType)
    {
        this.keyType = requireNonNull(keyType);
        this.valueType = requireNonNull(valueType);
        keyBlockBuilder = keyType.createBlockBuilder(null, EXPECTED_ENTRIES, expectedValueSize(keyType, EXPECTED_ENTRY_SIZE));
        valueBlockBuilder = valueType.createBlockBuilder(null, EXPECTED_ENTRIES, expectedValueSize(valueType, EXPECTED_ENTRY_SIZE));
    }