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https://issues.apache.org/jira/browse/FLINK-17356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17093166#comment-17093166
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Flavio Pompermaier commented on FLINK-17356:
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Yes I know tat they are not used right now, but this is true also for PKs..so I
think the hope is that the optimizer could consider those 2 in the future
> Properly set constraints (PK and UNIQUE)
> ----------------------------------------
>
> Key: FLINK-17356
> URL: https://issues.apache.org/jira/browse/FLINK-17356
> Project: Flink
> Issue Type: Sub-task
> Components: Connectors / JDBC, Table SQL / Ecosystem
> Reporter: Flavio Pompermaier
> Priority: Major
> Labels: pull-request-available
>
> At the moment the PostgresCatalog does not create field constraints (at the
> moment there's only UNIQUE and PRIMARY_KEY in the TableSchema..could it
> worth to add also NOT_NULL?)
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