```
touch /tmp/aaa.csv

CREATE TABLE log (A String) ENGINE= FileLog('/tmp/aaa.csv', 'CSV');
DB::Exception: The absolute data path should be inside `user_files_path`(/var/lib/clickhouse/user_files/). (BAD_ARGUMENTS)


CREATE TABLE log (A String) ENGINE= FileLog('/tmp/aaa.csv', 'CSV');
DB::Exception: Metadata files already exist by path: /var/lib/clickhouse/.filelog_storage_metadata/default/log, remove them manually if it is intended. (TABLE_METADATA_ALREADY_EXISTS)
```
if (auto meta = file_infos.meta_by_inode.find(inode);
                    meta != file_infos.meta_by_inode.end() && meta->second.file_name == file_name)
                    file_infos.meta_by_inode.erase(meta);
                if (std::filesystem::exists(getFullMetaPath(file_name)))
                    std::filesystem::remove(getFullMetaPath(file_name));
                file_infos.context_by_name.erase(it);
            }
            else
            {
                valid_files.push_back(file_name);
            }
        }
    }
    file_infos.file_names.swap(valid_files);
    
    assert(file_infos.file_names.size() == file_infos.meta_by_inode.size());
    assert(file_infos.file_names.size() == file_infos.context_by_name.size());
    return events.empty() || file_infos.file_names.empty();
}
NamesAndTypesList StorageFileLog::getVirtuals() const
{
    return NamesAndTypesList{{"_filename", std::make_shared<DataTypeString>()}, {"_offset", std::make_shared<DataTypeUInt64>()}};
}
Names StorageFileLog::getVirtualColumnNames()
{
    return {"_filename", "_offset"};
}
}