Github user sanjaydasgupta commented on the issue:
https://github.com/apache/zeppelin/pull/3064
There are similarities between the two features that all users will notice,
and think about for some time. There needs to be good documentation to avoid
any confusion. The substitution syntax {...} used in this feature is the same
as in ZEPPELIN-3377, but there is almost 0 possibility that the wrong features
will be invoked. More specifically, even if z-variable interpolation is enabled
(zeppelin.jdbc.interpolation = true), the contents of {...} will be safely
passed through since it is virtually impossible for a user to produce the
correct string to use to activate ZEPPELIN-3377's code.
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