{
column = new SimpleColumnMetadata(columnNames.get(i), TupleTypes._DOUBLE, 0, 0, 0);
}
columnsMetadata.add(column);
}
TupleMetadata outMetadata = new SimpleTupleMetadata(columnsMetadata);
mResultOutput.write(new MetadataWrapper(outMetadata));
for(List<Object> v:values) {