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https://issues.apache.org/jira/browse/FLINK-19869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553495#comment-17553495
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Martijn Visser commented on FLINK-19869:
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We should indeed not handle this as a {{RAW}} type but as a {{STRING}} type
> Flink SQL JDBC connector for Postgres can't handle UUID datatype
> ----------------------------------------------------------------
>
> Key: FLINK-19869
> URL: https://issues.apache.org/jira/browse/FLINK-19869
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / JDBC
> Affects Versions: 1.11.2
> Reporter: Jingwei Zhang
> Priority: Major
>
> Problem:
> UUID is not a SQL standard type. But it is supported by Postgres as an
> internal type which postgres client will help to convert to java.util.UUID
> when queried. However, it seems flink doesn't support it as a sql extension
> in PostgresCatalog. There is no uuid serializer provided for it, either. So
> if I want to filter a result set and put the filter result back to a table
> with same schema with uuid column type in it. I will have problem.
> Proposal:
> Handle UUID in postgres as a SQL extension. Use the DataTypes.RAW to wrap its
> original class info and its serializer so as to expose it as a RAW
> JDBCType(only in postgres) in PostgresCatalog.
> And meanwhile, for PostgresRowConverter, we could use BinaryRawValueData to
> handle those SQL extension for byte serialization/deserialization.
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