Docs: Add document how to export records from CDC/Upsert Stream into apache iceberg table.

[openinx]

I think this document should include those changes:

1. Flink: Support SQL primary key #2410
2. Flink: Add streaming upsert write option. #2863

[adiroy05]

hey i would like to work on this issue...assign to me

[hililiwei]

hey i would like to work on this issue...assign to me

don't have to be assigned. feel free to go on. :)

[Kshitiz-Mhto]

@adiroy05 if you busy doing some other work, can i work in place of you in this issue.

[Kshitiz-Mhto]

i am a newbie to open source so can you provide some helps.
where should i includes those change in
iceberg/docs/flink/flink-connector.md
or
iceberg/docs/flink/flink-getting-started.md
or u want something different?

[hililiwei]

@Kshitiz-Mhto Thank you very much for your interest. There are currently two PR's related to this, for reference:
#3827
#3823

[shreyanshR7]

Hello @openinx I am new to open source and want to work on this issue please guide me about the issue, the technical knowledge prerequisites to solve the issue, so that I can go through them and start working on the issue.

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[github-actions]

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