Method UNION

src/common/types/types.cpp:1472–1477

}

LogicalType LogicalType::UNION(std::vector<StructField>&& fields) {
    // TODO(Ziy): Use UINT8 to represent tag value.
    fields.insert(fields.begin(),
        StructField(UnionType::TAG_FIELD_NAME, LogicalType(UnionType::TAG_FIELD_TYPE)));
    return LogicalType(LogicalTypeID::UNION, std::make_unique<StructTypeInfo>(std::move(fields)));
}

LogicalType LogicalType::LIST(LogicalType childType) {
    return LogicalType(LogicalTypeID::LIST, std::make_unique<ListTypeInfo>(std::move(childType)));