```
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)
```
{
    for (const auto & file : file_infos.file_names)
    {
        auto & file_ctx = findInMap(file_infos.context_by_name, file);
        if (file_ctx.status != FileStatus::NO_CHANGE)
        {
            file_ctx.reader.emplace(getFullDataPath(file));
            auto & reader = file_ctx.reader.value();
            assertStreamGood(reader);
            reader.seekg(0, reader.end);
            assertStreamGood(reader);
            auto file_end = reader.tellg();
            assertStreamGood(reader);
            auto & meta = findInMap(file_infos.meta_by_inode, file_ctx.inode);
            if (meta.last_writen_position > static_cast<UInt64>(file_end))
            {
                throw Exception(
                    ErrorCodes::CANNOT_READ_ALL_DATA,
                    "Last saved offsset for File {} is bigger than file size ({} > {})",
                    file,
                    meta.last_writen_position,
                    file_end);
            }
            
            meta.last_open_end = file_end;
            reader.seekg(meta.last_writen_position);
            assertStreamGood(reader);
        }
    }