Github user zhongneu commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/713#issuecomment-184021909
I found that it is difficult to support multi-selection using string
substitution: ${var=value}, because we do not know how to expand it properly in
a query. We cannot simply expand it into comma-separated string, because the
users may want to use them in several other places (such as filtering
conditions). This will make the substitution syntax more complex.
Could we support checkboxes in ZeppelinContext exclusively?
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