How to use

set

method

in

org.apache.parquet.hadoop.mapred.Container

 @Override
 public boolean next(Void key, Container<V> value) throws IOException {
  if (eof) {
   return false;
  }
  if (firstRecord) { // key & value are already read.
   firstRecord = false;
   return true;
  }
  try {
   if (realReader.nextKeyValue()) {
    if (value != null) value.set(realReader.getCurrentValue());
    return true;
   }
  } catch (InterruptedException e) {
   throw new IOException(e);
  }
  eof = true; // strictly not required, just for consistency
  return false;
 }
}

 @Override
 public boolean next(Void key, Container<V> value) throws IOException {
  if (eof) {
   return false;
  }
  if (firstRecord) { // key & value are already read.
   firstRecord = false;
   return true;
  }
  try {
   if (realReader.nextKeyValue()) {
    if (value != null) value.set(realReader.getCurrentValue());
    return true;
   }
  } catch (InterruptedException e) {
   throw new IOException(e);
  }
  eof = true; // strictly not required, just for consistency
  return false;
 }
}

public RecordReaderWrapper(
  InputSplit oldSplit, JobConf oldJobConf, Reporter reporter)
  throws IOException {
 splitLen = oldSplit.getLength();
 try {
  realReader = new ParquetRecordReader<V>(
    ParquetInputFormat.<V>getReadSupportInstance(oldJobConf),
    ParquetInputFormat.getFilter(oldJobConf));
  if (oldSplit instanceof ParquetInputSplitWrapper) {
   realReader.initialize(((ParquetInputSplitWrapper) oldSplit).realSplit, oldJobConf, reporter);
  } else if (oldSplit instanceof FileSplit) {
   realReader.initialize((FileSplit) oldSplit, oldJobConf, reporter);
  } else {
   throw new IllegalArgumentException(
     "Invalid split (not a FileSplit or ParquetInputSplitWrapper): " + oldSplit);
  }
  // read once to gain access to key and value objects
  if (realReader.nextKeyValue()) {
   firstRecord = true;
   valueContainer = new Container<V>();
   valueContainer.set(realReader.getCurrentValue());
  } else {
   eof = true;
  }
 } catch (InterruptedException e) {
  Thread.interrupted();
  throw new IOException(e);
 }
}

public RecordReaderWrapper(
  InputSplit oldSplit, JobConf oldJobConf, Reporter reporter)
  throws IOException {
 splitLen = oldSplit.getLength();
 try {
  realReader = new ParquetRecordReader<V>(
    ParquetInputFormat.<V>getReadSupportInstance(oldJobConf),
    ParquetInputFormat.getFilter(oldJobConf));
  if (oldSplit instanceof ParquetInputSplitWrapper) {
   realReader.initialize(((ParquetInputSplitWrapper) oldSplit).realSplit, oldJobConf, reporter);
  } else if (oldSplit instanceof FileSplit) {
   realReader.initialize((FileSplit) oldSplit, oldJobConf, reporter);
  } else {
   throw new IllegalArgumentException(
     "Invalid split (not a FileSplit or ParquetInputSplitWrapper): " + oldSplit);
  }
  // read once to gain access to key and value objects
  if (realReader.nextKeyValue()) {
   firstRecord = true;
   valueContainer = new Container<V>();
   valueContainer.set(realReader.getCurrentValue());
  } else {
   eof = true;
  }
 } catch (InterruptedException e) {
  Thread.interrupted();
  throw new IOException(e);
 }
}