Method extractColumn

src/DataTypes/NestedUtils.cpp:637–658

{}

std::optional<ColumnWithTypeAndName> NestedColumnExtractHelper::extractColumn(const String & column_name)
{
    if (block.has(column_name, case_insentive))
        return {block.getByName(column_name, case_insentive)};

    auto nested_names = Nested::splitName(column_name);
    if (case_insentive)
    {
        boost::to_lower(nested_names.first);
        boost::to_lower(nested_names.second);
    }
    if (!block.has(nested_names.first, case_insentive))
        return {};

    if (!nested_tables.contains(nested_names.first))
    {
        ColumnsWithTypeAndName columns = {block.getByName(nested_names.first, case_insentive)};
        nested_tables[nested_names.first] = std::make_shared<Block>(Nested::flatten(columns));
    }

    return extractColumn(column_name, nested_names.first, nested_names.second);
}

std::optional<ColumnWithTypeAndName> NestedColumnExtractHelper::extractColumn(
    const String & original_column_name, const String & column_name_prefix, const String & column_name_suffix)