Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/883
A complex problem for sure. Certainly you are right with the Jira that
Binary types are currently not supported, and if the use case you describe
(coming from Avro) is the most common, then this is clearly an improvement :)
Perhaps we could add this improvement and then write a Jira to handle the
general case. Checking for a prefix is a decent approach but nothing will be
bulletproof, such is the nature of being able to describe the type of the data
vs being able to represent it when it must exist as a String (for attribute
values). The workaround for byte literals in the interim could be to put them
directly in the SQL statement (instead of attribute values).
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