Github user felixcheung commented on the issue:
https://github.com/apache/zeppelin/pull/2158
that's the thing, each of these implementation handles comments differently.
for instance, solr JDBC shares the same spec as
[presto](https://github.com/prestodb/presto/blob/master/presto-parser/src/main/antlr4/com/facebook/presto/sql/parser/SqlBase.g4)
(which is very common) - but it doesn't support empty comment `/**/` or
multiline comment `/*\n*/`
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