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https://issues.apache.org/jira/browse/IMPALA-12184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-12184.
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Resolution: Fixed
> Java UDF increment on an empty string is inconsistent
> -----------------------------------------------------
>
> Key: IMPALA-12184
> URL: https://issues.apache.org/jira/browse/IMPALA-12184
> Project: IMPALA
> Issue Type: Bug
> Affects Versions: Impala 4.3.0
> Reporter: Michael Smith
> Assignee: Peter Rozsa
> Priority: Major
> Fix For: Impala 4.3.0
>
>
> Java 8 and Java 11 seem to match different signatures for {{{}select
> increment("");{}}}, and one is implemented to return null for empty string
> while the other ends up returning empty string.
> When passed a string, which signature of BufferAlteringUdf matches it appears
> to be arbitrary: in Java 8, Class.getMethods() returns the BytesWritable
> signature first (and the Thrift STRING type fits that signature) while in
> Java 11 it returns the Text signature first (which Thrift STRING type also
> matches).
> This causes failures in query_test.test_udfs.TestUdfExecution.test_java_udfs
> (e.g. https://jenkins.impala.io/job/ubuntu-20.04-from-scratch-java11/11/).
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