Function create

src/DataTypes/DataTypeVariant.cpp:203–215

}

static DataTypePtr create(const ASTPtr & arguments)
{
    if (!arguments || arguments->children.empty())
        return std::make_shared<DataTypeVariant>(DataTypes{});

    DataTypes nested_types;
    nested_types.reserve(arguments->children.size());

    for (const ASTPtr & child : arguments->children)
        nested_types.emplace_back(DataTypeFactory::instance().get(child));

    return std::make_shared<DataTypeVariant>(nested_types);
}

bool isVariantExtension(const DataTypePtr & from_type, const DataTypePtr & to_type)
{