GitHub user avamingli added a comment to the discussion: [Ideas] Should we 
support ON CONFLICT when updating the distribution keys?

Yes, it’s definitely necessary to support the corresponding AM implementation. 
Unlike heap tables, figuring out how to use tokens to do lock tuples on AO 
tables is indeed a challenge.

At the moment, I’m thinking about a few things: how efficiently we can identify 
an AO tuple, how to set up the AO tuple "header" with that token flag as HEAP 
tuples, how tuples behave across segments, the possibility of splitting 
updates, and how to handle updates across partitions.


GitHub link: 
https://github.com/apache/cloudberry/discussions/902#discussioncomment-12358120

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