How to use

getMinorType

method

in

org.apache.arrow.vector.ValueVector

private void initFieldWriters() throws IOException {
 fieldConverters = Lists.newArrayList();
 try {
  int fieldId = 0;
  for (VectorWrapper w : batch) {
   if (w.getField().getName().equalsIgnoreCase(WriterPrel.PARTITION_COMPARATOR_FIELD)) {
    continue;
   }
   FieldReader reader = w.getValueVector().getReader();
   FieldConverter converter = getConverter(recordWriter, fieldId, w.getField().getName(),
     w.getValueVector().getMinorType(), reader);
   if (converter != null) {
    fieldId++;
    fieldConverters.add(converter);
   }
  }
 } catch(Exception e) {
  logger.error("Failed to create FieldWriter.", e);
  throw new IOException("Failed to initialize FieldWriters.", e);
 }
}

private void setWriter(ValueVector v, ArrowType arrowType) {
 state = State.SINGLE;
 vector = v;
 type = v.getMinorType();
 this.arrowType = arrowType;
 switch (type) {
  case STRUCT:
   writer = nullableStructWriterFactory.build((StructVector) vector);
   break;
  case LIST:
   writer = new UnionListWriter((ListVector) vector, nullableStructWriterFactory);
   break;
  case UNION:
   writer = new UnionWriter((UnionVector) vector, nullableStructWriterFactory);
   break;
  default:
   writer = type.getNewFieldWriter(vector);
   break;
 }
}

validateType(vector.getMinorType());

private FieldWriter promoteToUnion() {
 String name = vector.getField().getName();
 TransferPair tp = vector.getTransferPair(vector.getMinorType().name().toLowerCase(), vector.getAllocator());
 tp.transfer();
 if (parentContainer != null) {
  // TODO allow dictionaries in complex types
  unionVector = parentContainer.addOrGetUnion(name);
  unionVector.allocateNew();
 } else if (listVector != null) {
  unionVector = listVector.promoteToUnion();
 }
 unionVector.addVector((FieldVector) tp.getTo());
 writer = new UnionWriter(unionVector, nullableStructWriterFactory);
 writer.setPosition(idx());
 for (int i = 0; i <= idx(); i++) {
  unionVector.setType(i, vector.getMinorType());
 }
 vector = null;
 state = State.UNION;
 return writer;
}