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https://issues.apache.org/jira/browse/FLINK-27175?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu reassigned FLINK-27175:
-------------------------------
Assignee: luoyuxia
> Fail to call Hive UDAF when the UDAF is with only one parameter with array
> type
> -------------------------------------------------------------------------------
>
> Key: FLINK-27175
> URL: https://issues.apache.org/jira/browse/FLINK-27175
> Project: Flink
> Issue Type: Sub-task
> Reporter: luoyuxia
> Assignee: luoyuxia
> Priority: Major
> Labels: pull-request-available
>
> When try to call Hive's collect_list function, it'll throw the following
> exception:
>
> {code:java}
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
> [Ljava.lang.Object;
> at
> org.apache.flink.table.functions.hive.conversion.HiveInspectors.lambda$getConversion$7f882244$1(HiveInspectors.java:201)
> at
> org.apache.flink.table.functions.hive.HiveGenericUDAF.accumulate(HiveGenericUDAF.java:185)
> at LocalNoGroupingAggregateWithoutKeys$39.processElement(Unknown Source)
> {code}
> The reason is when the parameter is a single array, Flink calls
> udf.accumulate(AggregationBuffer, Array[Double]), at this point java's
> var-args will cast Array[Double] to Array[Object]and let it be Object... args.
> {code:java}
> public void accumulate(GenericUDAFEvaluator.AggregationBuffer acc, Object...
> inputs) {code}
> Then it will consider the elements in the array as parameters.
>
> The exception will also happen for other similar Hive UDAF.
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