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https://issues.apache.org/jira/browse/FLINK-18168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17127620#comment-17127620
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Benchao Li commented on FLINK-18168:
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[~FrankZou] Thanks for reporting this bug. Do you want to fix this?
> Error results when use UDAF with Object Array return type
> ---------------------------------------------------------
>
> Key: FLINK-18168
> URL: https://issues.apache.org/jira/browse/FLINK-18168
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Reporter: Zou
> Priority: Major
>
> I get error results when I use an UDAF with Object Array return type (e.g.
> Row[]). I find that the problem is we reuse 'reuseArray' as the return value
> of ObjectArrayConverter.toBinaryArray(). It leads to 'prevAggValue' and
> 'newAggValue' in GroupAggFunction.processElement() contains exactly the same
> BinaryArray, so 'equaliser.equalsWithoutHeader(prevAggValue, newAggValue)' is
> always true.
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