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Posted to dev@drill.apache.org by "Bohdan Kazydub (JIRA)" <ji...@apache.org> on 2018/10/23 08:10:00 UTC

[jira] [Created] (DRILL-6810) Disable NULL_IF_NULL NullHandling for functions with ComplexWriter

Bohdan Kazydub created DRILL-6810:
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             Summary: Disable NULL_IF_NULL NullHandling for functions with ComplexWriter
                 Key: DRILL-6810
                 URL: https://issues.apache.org/jira/browse/DRILL-6810
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Bohdan Kazydub
            Assignee: Bohdan Kazydub


Currently NullHandling.NULL_IF_NULL is allowed for UDFs with @Output of type org.apache.drill.exec.vector.complex.writer.BaseWriter.ComplexWriter but no null handling is performed for the kind of functions which leads to confusion. The problem is ComplexWriter holds list/map values and Drill does not yet support NULL values for the types (there is an issue to allow null maps/lists in [DRILL-4824|https://issues.apache.org/jira/browse/DRILL-4824]).
For such functions support for NULL_IF_NULL will be disabled, as it is done for aggregate functions, and NullHandling.INTERNAL should be used instead.



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