Function convertToMapKeyString

src/DataTypes/MapHelpers.cpp:165–169

}

String convertToMapKeyString(const DataTypePtr & key_type, const String & key_name)
{
    Field key_field = convertToMapKeyField(key_type, key_name);
    return applyVisitor(DB::FieldVisitorToString(), key_field); // convert to correct implicit key name
}

String genMapKeyFilePrefix(const String & column)
{