from docarray import Document, DocumentArray

with DocumentArray(
    storage='milvus',
    config={'n_dim': 3,},
) as da:
    da.extend([Document(id=f'{i}',) for i in range(10)])

ids = ['1', '2', '3', '1', '2', '3']
print(da[ids]) # this will print <DocumentArray (length=3) at xxx>
print(da[ids][:, 'id']) # this will print ['1', '2', '3']
print(len(da[ids])) # this will print 3