Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/7709#issuecomment-126545080
Probably we need to make the cache for the `dict`, as in most of cases the
`matching` and the `replace` string are literal.
Anyway, I can leave it for further improvement.
@rxin @davies can we merge that first? As the code freeze in next 1 or 2
days.
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