[jira] [Created] (NIFI-8046) ResultSetRecordSet throws exception on DB2

["Matt Burgess (Jira)" <ji...@apache.org>]

Matt Burgess created NIFI-8046:
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             Summary: ResultSetRecordSet throws exception on DB2
                 Key: NIFI-8046
                 URL: https://issues.apache.org/jira/browse/NIFI-8046
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
            Reporter: Matt Burgess


Consumers of ResultSetRecordSet (such as QueryDatabaseTableRecord) can end up with an exception being thrown when processing the results. This is due to DB2 behavior that closes a ResultSet when the last row has been read, meaning next() can return true then isClosed() can return true.

This was handled in general for the QueryDatabaseTable processors via NIFI-5303 (even though only QDT itself existed at the time, not QueryDatabaseTableRecord). However QueryDatabaseTableRecord uses ResultSetRecordSet, which calls ResultSet.next() before creating a schema from the ResultSet. On DB2 (if the result set is empty, e.g.) this results in an exception being thrown when ResultSet.getMetaData() is called from createSchema().



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