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https://issues.apache.org/jira/browse/DRILL-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16666943#comment-16666943
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ASF GitHub Bot commented on DRILL-6810:
---------------------------------------
KazydubB commented on a change in pull request #1509: DRILL-6810: Disable
NULL_IF_NULL NullHandling for functions with Comp…
URL: https://github.com/apache/drill/pull/1509#discussion_r228601836
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/Mappify.java
##########
@@ -50,15 +50,18 @@
* scalar value fields
* value fields need to be of the same data type
*/
- @FunctionTemplate(names = {"mappify", "kvgen"}, scope =
FunctionTemplate.FunctionScope.SIMPLE, nulls =
FunctionTemplate.NullHandling.NULL_IF_NULL, isRandom = true)
+ @FunctionTemplate(names = {"mappify", "kvgen"}, scope =
FunctionTemplate.FunctionScope.SIMPLE, isRandom = true)
public static class ConvertMapToKeyValuePairs implements DrillSimpleFunc {
+
@Param FieldReader reader;
@Inject DrillBuf buffer;
@Output ComplexWriter writer;
+ @Override
public void setup() {
}
+ @Override
Review comment:
It looks like it can't be null. Checked on ```select mappify(foo) from
`mappify.json`;``` where `mappify.json` contains a single entry `{foo: null}`.
In this case `reader` is generated based on input's `ValueVector`.
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> 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
> Affects Versions: 1.14.0
> Reporter: Bohdan Kazydub
> Assignee: Bohdan Kazydub
> Priority: Major
> Fix For: 1.15.0
>
>
> 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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