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https://issues.apache.org/jira/browse/FLINK-27873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17551181#comment-17551181
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Yaroslav Tkachenko commented on FLINK-27873:
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Re: 1.15, I haven't actually tried reproducing it on 1.15, but the files that I
linked haven't changed between 1.14.4 and now, so I'm fairly confident it's not
fixed.
> Primary key is lost after calling addColumns
> --------------------------------------------
>
> Key: FLINK-27873
> URL: https://issues.apache.org/jira/browse/FLINK-27873
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Affects Versions: 1.14.4
> Reporter: Yaroslav Tkachenko
> Priority: Major
>
> I've noticed that when adding new columns via *addColumns* method in the
> Table API the information about the primary key is lost.
> I was able to track it down to the following files:
> *
> [ProjectionOperationFactory.create|https://github.com/apache/flink/blob/fbc086f2fd63dac4af3e104ba4011e864781139a/flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/utils/ProjectionOperationFactory.java#L91-L92]
> creates a new QueryOperation for the updated table and it calls
> *ResolvedSchema.physical* method in the end.
> *
> [ResolvedSchema.physical|https://github.com/apache/flink/blob/94328f90c5a3d13acff6dfbf2e22d1c7aa59c080/flink-table/flink-table-common/src/main/java/org/apache/flink/table/catalog/ResolvedSchema.java#L97]
> method always creates ResolvedSchema with null as a primary key.
> This is not a behaviour I'd expect when _adding_ new columns.
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