Function tryGetFlattenableTuple

src/DataTypes/NestedUtils.cpp:282–288

}

const DataTypeTuple * tryGetFlattenableTuple(const DataTypePtr & type)
{
    const auto * tuple_type = typeid_cast<const DataTypeTuple *>(type.get());
    if (tuple_type && !tuple_type->getElements().empty() && !type->hasCustomName())
        return tuple_type;
    return nullptr;
}

/// Recursively flattens one (column, type) into its leaf columns, calling
/// `emit_leaf(column, type, name, ancestors)` once per leaf. A leaf is anything