Hi, I wanted to bring up the topic of primary key constraints that we could leverage for runtime optimizations. Please have a look at the proposal and I would especially draw your attention to the topic of nullability of columns that are part of a primary key. Some time in the future we will also be able to leverage it for upserting streaming tables.
Here is the proposal: https://cwiki.apache.org/confluence/display/FLINK/FLIP+87%3A+Primary+key+constraints+in+Table+API Best, Dawid
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