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https://issues.apache.org/jira/browse/FLINK-20386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247596#comment-17247596
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jiawen xiao commented on FLINK-20386:
-------------------------------------
I will create a PR to fix
> ClassCastException when lookup join a JDBC table on INT UNSIGNED column
> -----------------------------------------------------------------------
>
> Key: FLINK-20386
> URL: https://issues.apache.org/jira/browse/FLINK-20386
> Project: Flink
> Issue Type: Bug
> Components: Connectors / JDBC, Table SQL / Ecosystem
> Affects Versions: 1.12.0, 1.11.2
> Reporter: Jark Wu
> Assignee: jiawen xiao
> Priority: Major
>
> The primary key of the MySQL is an INT UNSIGNED column, but declared INT in
> Flink.
> I know the
> [docs|https://ci.apache.org/projects/flink/flink-docs-release-1.11/dev/table/connectors/jdbc.html#data-type-mapping]
> say it should be decalred BIGINT in Flink, however, would be better not fail
> the job.
> At least, the exception is hard to understand for users. We can also check
> the schema before start the job.
> {code}
> java.lang.ClassCastException: java.lang.Long cannot be cast to
> java.lang.Integer
> at
> org.apache.flink.table.data.GenericRowData.getInt(GenericRowData.java:149)
> ~[flink-table-blink_2.11-1.11-vvr-2.1.1-SNAPSHOT.jar:1.11-vvr-2.1.1-SNAPSHOT]
> at JoinTableFuncCollector$6460.collect(Unknown Source) ~[?:?]
> at
> org.apache.flink.table.functions.TableFunction.collect(TableFunction.java:203)
> ~[flink-table-blink_2.11-1.11-vvr-2.1.1-SNAPSHOT.jar:1.11-vvr-2.1.1-SNAPSHOT]
> at
> org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunction.eval(JdbcRowDataLookupFunction.java:162)
> ~[?:?]
> {code}
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