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https://issues.apache.org/jira/browse/DRILL-7677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070945#comment-17070945
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Bohdan Kazydub commented on DRILL-7677:
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In the example UDF you are referencing there is a [nullability
check|https://github.com/apache/drill/blob/master/contrib/udfs/src/main/java/org/apache/drill/exec/udfs/UserAgentFunctions.java#L104]
before calling the
{{org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.getStringFromVarCharHolder(input)}}
to make sure this method is not invoked when {{input.isSet == 0}}. So no NPE
is thrown, is it?
Could you provide an example of the issue you're having, please?
> NPE in getStringFromVarCharHolder(NullableVarCharHolder)
> ---------------------------------------------------------
>
> Key: DRILL-7677
> URL: https://issues.apache.org/jira/browse/DRILL-7677
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Niels Basjes
> Priority: Major
>
> Assume you have a function ([like this
> one|https://github.com/apache/drill/blob/master/contrib/udfs/src/main/java/org/apache/drill/exec/udfs/UserAgentFunctions.java#L110])
> that has
> {code:java}
> @Param
> NullableVarCharHolder input;
> {code}
> and in the {code:java}eval(){code} function you do
> {code:java}String inputString =
> org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.getStringFromVarCharHolder(input);{code}
> When this function is called with the input actually being null the 'input'
> parameter is an instance of NullableVarCharHolder where isSet is 0 and buffer
> is null.
> The buffer being null causes an NPE in the call to
> getStringFromVarCharHolder(NullableVarCharHolder)
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