message: fixed gzip seek->beg issue for gcc-9
diff: @@ -146,8 +146,14 @@ void BufferedCSVReader::ResetBuffer() {
  }
  void BufferedCSVReader::ResetStream() {
  + if (!plain_file_source && StringUtil::EndsWith(StringUtil::Lower(info.file_path), ".gz")) {
  + // seeking to the beginning appears to not be supported in all compiler/os-scenarios,
  + // so we have to create a new stream source here for now
  + source = make_unique<GzipStream>(info.file_path);
  + } else{
  source->clear();
  source->seekg(0, source->beg);
  + }
  linenr = 0;
  linenr_estimated = false;
  bytes_per_line_avg = 0;
  