Github user sanjaydasgupta commented on the issue:
https://github.com/apache/zeppelin/pull/2502
Thanks for the suggestions @felixcheung
I was not able to find more documentation on Jupyter's feature, but tried
it with many different variants. There are some behaviors that had not been
found earlier, so I have added it to the implementation and the documentation.
I also gave the documentation section a more distinctive title.
One of the things I learned about Jupyter's implementation is that it never
intercepts an error case. All command strings are passed through to the
underlying command -- with or without interpolation. Any use of '{' and/or '}'
that does not appear to be part of a well-formed _pattern_ causes Jupyter to
pass on the entire command string unchanged. This happens even when the command
string contains other patterns that are well-formed, and could be interpolated.
So, there is now no need to return a status value to indicate the
success/failure of the interpolation. The string returned by the interpolation
function is generated by emulating Jupyter's behavior in the same situation.
I have also moved the interpolation function into the superclass
[Interpreter.java](https://github.com/sanjaydasgupta/zeppelin/commit/9e75333ff7ef9c27678382c598b524eafc6191f7#diff-f9d22f7302ae356454cdcc637942856fR493)
to enable it to be shared and used by other interpreters too. This follows a
suggestion from @Leemoonsoo earlier in the PR. My implementation of this
feature for the Shell interpreter is also ready, and I will submit a PR once
this one is done.
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