How to use

reset

method

in

io.prestosql.orc.DictionaryCompressionOptimizer

public void reset()
{
  rowCount = 0;
  optimizer.reset();
  for (TestDictionaryColumn dictionaryColumn : dictionaryColumns) {
    dictionaryColumn.reset();
  }
}

private void flushStripe(FlushReason flushReason)
    throws IOException
{
  List<OrcDataOutput> outputData = new ArrayList<>();
  long stripeStartOffset = orcDataSink.size();
  // add header to first stripe (this is not required but nice to have)
  if (closedStripes.isEmpty()) {
    outputData.add(createDataOutput(MAGIC));
    stripeStartOffset += MAGIC.length();
  }
  // add stripe data
  outputData.addAll(bufferStripeData(stripeStartOffset, flushReason));
  // if the file is being closed, add the file footer
  if (flushReason == CLOSED) {
    outputData.addAll(bufferFileFooter());
  }
  // write all data
  orcDataSink.write(outputData);
  // open next stripe
  columnWriters.forEach(ColumnWriter::reset);
  dictionaryCompressionOptimizer.reset();
  rowGroupRowCount = 0;
  stripeRowCount = 0;
  bufferedBytes = toIntExact(columnWriters.stream().mapToLong(ColumnWriter::getBufferedBytes).sum());
}

private void flushStripe(FlushReason flushReason)
    throws IOException
{
  List<OrcDataOutput> outputData = new ArrayList<>();
  long stripeStartOffset = orcDataSink.size();
  // add header to first stripe (this is not required but nice to have)
  if (closedStripes.isEmpty()) {
    outputData.add(createDataOutput(MAGIC));
    stripeStartOffset += MAGIC.length();
  }
  // add stripe data
  outputData.addAll(bufferStripeData(stripeStartOffset, flushReason));
  // if the file is being closed, add the file footer
  if (flushReason == CLOSED) {
    outputData.addAll(bufferFileFooter());
  }
  // write all data
  orcDataSink.write(outputData);
  // open next stripe
  columnWriters.forEach(ColumnWriter::reset);
  dictionaryCompressionOptimizer.reset();
  rowGroupRowCount = 0;
  stripeRowCount = 0;
  bufferedBytes = toIntExact(columnWriters.stream().mapToLong(ColumnWriter::getBufferedBytes).sum());
}

public void reset()
{
  rowCount = 0;
  optimizer.reset();
  for (TestDictionaryColumn dictionaryColumn : dictionaryColumns) {
    dictionaryColumn.reset();
  }
}