/**
* It writes a list type and its array elements to the Parquet RecordConsumer. This is called when
* the original type (LIST) is detected by writeValue()
*
* @param array The list of array values that contains the repeated array group type
* @param type Type that contains information about the group schema
*/
private void writeArray(final ArrayWritable array, final GroupType type) {
GroupType repeatedType = type.getType(0).asGroupType();
ArrayWritable repeatedValue = (ArrayWritable) array.get()[0];
recordConsumer.startGroup();
recordConsumer.startField(repeatedType.getName(), 0);
Writable[] array_values = repeatedValue.get();
for (int record = 0; record < array_values.length; record++) {
recordConsumer.startGroup();
// Null values must be wrapped into startGroup/endGroup
Writable element = array_values[record];
if (element != null) {
for (int i = 0; i < type.getFieldCount(); i++) {
Type fieldType = repeatedType.getType(i);
String fieldName = fieldType.getName();
recordConsumer.startField(fieldName, i);
writeValue(element, fieldType);
recordConsumer.endField(fieldName, i);
}
}
recordConsumer.endGroup();
}
recordConsumer.endField(repeatedType.getName(), 0);
recordConsumer.endGroup();
}
/**
* It writes a map type and its key-pair values to the Parquet RecordConsumer. This is called when
* the original type (MAP) is detected by writeValue()
*
* @param value The list of map values that contains the repeated KEY_PAIR_VALUE group type
* @param type Type that contains information about the group schema
*/
private void writeMap(final ArrayWritable value, final GroupType type) {
GroupType repeatedType = type.getType(0).asGroupType();
ArrayWritable repeatedValue = (ArrayWritable) value.get()[0];
recordConsumer.startGroup();
recordConsumer.startField(repeatedType.getName(), 0);
Writable[] map_values = repeatedValue.get();
for (int record = 0; record < map_values.length; record++) {
Writable key_value_pair = map_values[record];
if (key_value_pair != null) {
// Hive wraps a map key-pair into an ArrayWritable
if (key_value_pair instanceof ArrayWritable) {
writeGroup((ArrayWritable) key_value_pair, repeatedType);
} else {
throw new RuntimeException(
"Map key-value pair is not an ArrayWritable object on record " + record);
}
} else {
throw new RuntimeException("Map key-value pair is null on record " + record);
}
}
recordConsumer.endField(repeatedType.getName(), 0);
recordConsumer.endGroup();
}
/**
* It writes all the fields contained inside a group to the RecordConsumer.
*
* @param value The list of values contained in the group.
* @param type Type that contains information about the group schema.
*/
public void writeGroupFields(final ArrayWritable value, final GroupType type) {
if (value != null) {
for (int i = 0; i < type.getFieldCount(); i++) {
Type fieldType = type.getType(i);
String fieldName = fieldType.getName();
Writable fieldValue = value.get()[i];
// Parquet does not write null elements
if (fieldValue != null) {
recordConsumer.startField(fieldName, i);
writeValue(fieldValue, fieldType);
recordConsumer.endField(fieldName, i);
}
}
}
}