Github user zhongneu commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/713#issuecomment-184118084
I was a little bit worried about this approach may not be very robust: we
have several reserved characters: `${}|(),`. Because the users will put more
syntactic elements inside, they may conflict with the reserved characters.
However, this is definitely a promising solution, if we document it
appropriately.
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