This is a bug in the way NiFi handles BigInteger objects with respect to Avro, I have written it up in Apache Jira:
https://issues.apache.org/jira/browse/NIFI-2531
If possible to redefine your column types, you may be able to pick a type that will fit in a "long" object under the hood, such as INT(19) in MySQL or something like that.
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