Github user tinkoff-dwh commented on the issue:
https://github.com/apache/zeppelin/pull/2442
it is JDBC interpretator, set variables in first paragraph will not work
because we have connection pool and the paragraphs will be executed in
different statemnets. What problem with shared notes. Фny user can execute and
everyone will have their `precode`. `set search_path='#{user}` #{user} will
be replaced with the username from the context
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