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https://issues.apache.org/jira/browse/FLINK-31835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17794179#comment-17794179
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Timo Walther commented on FLINK-31835:
--------------------------------------
{quote}
My only concern is the compatibility problem. What do you think Timo Walther?
Is there any potential problems?
{quote}
Sorry that I did not answer earlier [~jark]. But my answer would have been yes,
there are compatibility problems.
Hints are not perfect. Sometimes a user needs to override the
{{getTypeInference()}} with
{code}
outputTypeStrategy(() ->
DataTypes.ARRAY(INT().notNull()).bringedTo(int[].class))
{code}
if a class other that the default class should be used. The default class of
INT is Integer, thus the default class for array is Integer[].
> DataTypeHint don't support Row<i Array<int>>
> --------------------------------------------
>
> Key: FLINK-31835
> URL: https://issues.apache.org/jira/browse/FLINK-31835
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.15.4
> Reporter: jeff-zou
> Assignee: Aitozi
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.18.0
>
>
> Using DataTypeHint("Row<t ARRAY<INT>>") in a UDF gives the following error:
>
> {code:java}
> Caused by: java.lang.ClassCastException: class [I cannot be cast to class
> [Ljava.lang.Object; ([I and [Ljava.lang.Object; are in module java.base of
> loader 'bootstrap')
> org.apache.flink.table.data.conversion.ArrayObjectArrayConverter.toInternal(ArrayObjectArrayConverter.java:40)
> org.apache.flink.table.data.conversion.DataStructureConverter.toInternalOrNull(DataStructureConverter.java:61)
> org.apache.flink.table.data.conversion.RowRowConverter.toInternal(RowRowConverter.java:75)
> org.apache.flink.table.data.conversion.RowRowConverter.toInternal(RowRowConverter.java:37)
> org.apache.flink.table.data.conversion.DataStructureConverter.toInternalOrNull(DataStructureConverter.java:61)
> StreamExecCalc$251.processElement_split9(Unknown Source)
> StreamExecCalc$251.processElement(Unknown Source)
> org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:82)
> {code}
>
> The function is as follows:
> {code:java}
> @DataTypeHint("Row<t ARRAY<INT>>")
> public Row eval() {
> int[] i = new int[3];
> return Row.of(i);
> } {code}
>
> This error is not reported when testing other simple types, so it is not an
> environmental problem.
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