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https://issues.apache.org/jira/browse/IMPALA-5580?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Hecht resolved IMPALA-5580.
-------------------------------
Resolution: Fixed
Fix Version/s: Impala 2.10.0
commit 3a49b4c7c9c30cd654eb156c24fd5d2a2f040cba
Author: Dan Hecht <dhe...@cloudera.com>
Date: Thu Jul 6 13:49:53 2017 -0700
IMPALA-5580: fix Java UDFs that return NULL strings
In commit 741421de, we accidently made it so that is_null=true
StringVals became is_null=false with len=0. Fix that and add
a regression test.
Change-Id: I34d288aad66a2609484058c9a177c02200cb6a6e
> Java UDF: return null STRING incorrectly converted to empty string
> ------------------------------------------------------------------
>
> Key: IMPALA-5580
> URL: https://issues.apache.org/jira/browse/IMPALA-5580
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Lorenzo Bagni
> Assignee: Dan Hecht
> Priority: Blocker
> Labels: correctness, ramp-up
> Fix For: Impala 2.10.0
>
>
> Hi all,
> I'm facing on wrong behaviour using Java UDF, when i declare a 'return null;'
> inside the code and I call the function the value returned is a blank (like
> '' or "") value.
> This happen when the input type is a STRING, just to be sure I've used the
> TestUdf:
> http://impala.io/doc/html/TestUdf_8java_source.html
> here's my tests:
> {code:sql}
> [host:21000] > select testudf(cast(null as int));
> Query: select testudf(cast(null as int))
> --------------------------------+
> | dwh.testudf(cast(null as int)) |
> +--------------------------------+
> | NULL |
> +--------------------------------+
> Fetched 1 row(s) in 0.12s
> [host:21000] > select testudf(cast(null as string));
> Query: select testudf(cast(null as string))
> +-----------------------------------+
> | dwh.testudf(cast(null as string)) |
> +-----------------------------------+
> | |
> +-----------------------------------+
> Fetched 1 row(s) in 0.15s
> [host:21000] > select testudf(cast(null as string)) is null;
> Query: select testudf(cast(null as string)) is null
> +-------------------------------------------+
> | dwh.testudf(cast(null as string)) is null |
> +-------------------------------------------+
> | false |
> +-------------------------------------------+
> Fetched 1 row(s) in 0.12s
> [host:21000] > select testudf(cast(null as int)) is null;
> Query: select testudf(cast(null as int)) is null
> +----------------------------------------+
> | dwh.testudf(cast(null as int)) is null |
> +----------------------------------------+
> | true |
> +----------------------------------------+
> Fetched 1 row(s) in 0.15s
> {code}
> On impala v2.6.0 the same UDF works correcty.
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