count the number of bits set to 1 in a bit string field

Hi, is there a built in function that will give me the number of bits
that are set to 1 in a bit string field?

Thanks,

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Rajarshi Guha  <rguha@indiana.edu>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04  06F7 1BB9 E634 9B87 56EE
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