Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7812#issuecomment-126725851
@HuJiayin This is situation that is not well defined. For some
non-letters, for example, numbers and '-', they should be skipped, see
http://rosettacode.org/wiki/Soundex. They current approach just treat all
non-letters the same way.
We can re-visit this, if it really bother users.
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