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https://issues.apache.org/jira/browse/ASTERIXDB-2136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xikui Wang resolved ASTERIXDB-2136.
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Resolution: Fixed
Resolved with patch in https://asterix-gerrit.ics.uci.edu/#/c/2082/
> External UDF writes records without checking datatype
> -----------------------------------------------------
>
> Key: ASTERIXDB-2136
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2136
> Project: Apache AsterixDB
> Issue Type: Bug
> Reporter: Xikui Wang
> Assignee: Xikui Wang
>
> The result returned by external UDF is not verified by datatype. If the
> record type doesn't conform to the configuration, execution result will be
> written successfully, but it cannot be accessed by record reader due to the
> record type mismatch.
> Also, we intend to return NULL for an invalid input parameter, but it's not
> clear when the return type is a record, how to set the record to be
> MISSING/NULL. This will also cause a reading exception. For simplicity, we
> will throw an exception when UDF cannot produce the expected result.
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