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https://issues.apache.org/jira/browse/FLINK-15607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17016469#comment-17016469
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Jingsong Lee commented on FLINK-15607:
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[~jark] We have tests, though very simple. In
{{HiveCatalogUseBlinkITCase.testBlinkUdf}}.
> throw exception when users trying to use Hive aggregate functions in
> streaming mode
> -----------------------------------------------------------------------------------
>
> Key: FLINK-15607
> URL: https://issues.apache.org/jira/browse/FLINK-15607
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Hive, Table SQL / API
> Reporter: Bowen Li
> Priority: Major
>
> Due to that Hive functions are all built for batch processing, aggregate
> functions in Hive that implement UDAF and GenericUDAFResolver2 interfaces may
> have unpredictable behaviors when used in streaming mode in Flink. We advice
> users to only use Hive aggregate functions interfaces in batch mode.
>
> It will be better to throw exception when users trying to use Hive aggregate
> functions in streaming mode. Seems need to distinguish execution mode in
> FunctionCatalogOperatorTable, which is not achievable yet.
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