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https://issues.apache.org/jira/browse/FLINK-31828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717792#comment-17717792
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Vladimir Matveev commented on FLINK-31828:
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Cool, thank you very much!
> List field in a POJO data stream results in table program compilation failure
> -----------------------------------------------------------------------------
>
> Key: FLINK-31828
> URL: https://issues.apache.org/jira/browse/FLINK-31828
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 1.16.1
> Environment: Java 11
> Flink 1.16.1
> Reporter: Vladimir Matveev
> Priority: Major
> Labels: pull-request-available
> Attachments: MainPojo.java, generated-code.txt, stacktrace.txt
>
>
> Suppose I have a POJO class like this:
> {code:java}
> public class Example {
> private String key;
> private List<Map<String, String>> values;
> // getters, setters, equals+hashCode omitted
> }
> {code}
> When a DataStream with this class is converted to a table, and some
> operations are performed on it, it results in an exception which explicitly
> says that I should file a ticket:
> {noformat}
> Caused by: org.apache.flink.api.common.InvalidProgramException: Table program
> cannot be compiled. This is a bug. Please file an issue.
> {noformat}
> Please find the example Java code and the full stack trace attached.
> From the exception and generated code it seems that Flink is upset with the
> list field being treated as an array - but I cannot have an array type there
> in the real code.
> Also note that if I _don't_ specify the schema explicitly, it then maps the
> {{values}} field to a `RAW('java.util.List', '...')` type, which also does
> not work correctly and fails the job in case of even simplest operations like
> printing.
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