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Posted to issues@nifi.apache.org by "Robert Bruno (JIRA)" <ji...@apache.org> on 2018/06/15 19:20:00 UTC

[jira] [Created] (NIFI-5316) Potential bug with Fetch Parquet

Robert Bruno created NIFI-5316:
----------------------------------

             Summary: Potential bug with Fetch Parquet
                 Key: NIFI-5316
                 URL: https://issues.apache.org/jira/browse/NIFI-5316
             Project: Apache NiFi
          Issue Type: Bug
    Affects Versions: 1.6.0
            Reporter: Robert Bruno


I have used PutParquet to create Parquet files from Nifi Records.  In trying to convert the parquet back to json by using FetchParquet, I keep getting errors on what seems like any array field.  I have had successes on data that contained no arrays.

The error in the log is cannont convert a value [xxx, yyy] where xxx and yyy are random strings of type class java.util.ArrayList because no compatible type exist in the UNION of field z.

I am also see the same error when the value is [] (empty array) as well.  

I have been successful gong from json to avro and avro to json with the same schema registry values.

I am defining array fields as follows:

"type" : [

  "null",

  {

      "type" : "array",

       "items" : "string"

}

],

"default": null

}

 

 



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