Doc non-append-only process-time temporal join

[WanYixian]

Info

• Description

  • Previously, we only supported append-only process-time temporal join, now support non-append-only one

• Related code PR

  • feat(stream): support non-append-only process time temporal join risingwave#16286

• Related doc issue

  Resolves Document: feat(stream): support non-append-only process time temporal join #2086

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• I have checked the doc site preview, and the updated parts look good.

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[chenzl25]

I just realized that the sql of temporal join should be changed from:

SELECT transaction_id, product_id, quantity, sale_date, product_name, price 
FROM sales
JOIN products FOR SYSTEM_TIME AS OF PROCTIME()
ON product_id = id

to :

SELECT transaction_id, product_id, quantity, sale_date, product_name, price 
FROM sales
JOIN products FOR SYSTEM_TIME AS OF PROCTIME()
ON product_id = id where process_time between valid_from and valid_to

[ShanlanLi]

The statement below may lack a ";":

[chenzl25]

LGTM，thanks.