Program: 4613
Project: 4613
Buggy source:
@Override public DatasetSpecification reconfigure(String instanceName,DatasetProperties properties,DatasetSpecification currentSpec) throws IncompatibleUpdateException {
  Partitioning oldPartitioning=PartitionedFileSetProperties.getPartitioning(currentSpec.getProperties());
  Partitioning newPartitioning=PartitionedFileSetProperties.getPartitioning(properties.getProperties());
  Preconditions.checkNotNull(oldPartitioning,"String_Node_Str");
  Preconditions.checkNotNull(newPartitioning,"String_Node_Str");
  if (!Iterators.elementsEqual(oldPartitioning.getFields().entrySet().iterator(),newPartitioning.getFields().entrySet().iterator())) {
    throw new IncompatibleUpdateException(String.format("String_Node_Str",oldPartitioning,newPartitioning));
  }
  DatasetProperties indexedTableProperties=DatasetProperties.builder().addAll(properties.getProperties()).add(IndexedTable.INDEX_COLUMNS_CONF_KEY,INDEXED_COLS).build();
  return DatasetSpecification.builder(instanceName,getName()).properties(properties.getProperties()).datasets(AbstractDatasetDefinition.reconfigure(filesetDef,FILESET_NAME,properties,currentSpec.getSpecification(FILESET_NAME)),AbstractDatasetDefinition.reconfigure(indexedTableDef,PARTITION_TABLE_NAME,indexedTableProperties,currentSpec.getSpecification(PARTITION_TABLE_NAME))).build();
}

Fixed version (ground truth):
@Override public DatasetSpecification reconfigure(String instanceName,DatasetProperties properties,DatasetSpecification currentSpec) throws IncompatibleUpdateException {
  Partitioning oldPartitioning=PartitionedFileSetProperties.getPartitioning(currentSpec.getProperties());
  Partitioning newPartitioning=PartitionedFileSetProperties.getPartitioning(properties.getProperties());
  Preconditions.checkNotNull(oldPartitioning,"String_Node_Str");
  Preconditions.checkNotNull(newPartitioning,"String_Node_Str");
  if (!Iterators.elementsEqual(oldPartitioning.getFields().entrySet().iterator(),newPartitioning.getFields().entrySet().iterator())) {
    throw new IncompatibleUpdateException(String.format("String_Node_Str",oldPartitioning,newPartitioning));
  }
  Map<String,String> pfsProperties=new HashMap<>(properties.getProperties());
  DatasetProperties indexedTableProperties=DatasetProperties.builder().addAll(properties.getProperties()).add(IndexedTable.INDEX_COLUMNS_CONF_KEY,INDEXED_COLS).build();
  DatasetSpecification currentFileSpec=currentSpec.getSpecification(FILESET_NAME);
  DatasetProperties.Builder newFileProperties=DatasetProperties.builder().addAll(properties.getProperties());
  String useNameAsBasePathDefault=currentSpec.getProperty(NAME_AS_BASE_PATH_DEFAULT);
  if (Boolean.parseBoolean(useNameAsBasePathDefault) && !properties.getProperties().containsKey(FileSetProperties.BASE_PATH)) {
    newFileProperties.add(FileSetProperties.BASE_PATH,instanceName);
    pfsProperties.put(NAME_AS_BASE_PATH_DEFAULT,Boolean.TRUE.toString());
  }
  return DatasetSpecification.builder(instanceName,getName()).properties(pfsProperties).datasets(AbstractDatasetDefinition.reconfigure(filesetDef,FILESET_NAME,newFileProperties.build(),currentFileSpec),AbstractDatasetDefinition.reconfigure(indexedTableDef,PARTITION_TABLE_NAME,indexedTableProperties,currentSpec.getSpecification(PARTITION_TABLE_NAME))).build();
}