Piotr Wieczorek a32e8091a9 alternator, cdc: Don't emit an event for equal items ...

This commit adds a function that compares split mutations with the
`row_state`, that was selected as a preimage or propagated through
cdc options by a caller. If the items are equal, the corresponding log
row isn't generated. The result being that creating an item with
BatchWriteItem, PutItem, or UpdateItem doesn't emit an INSERT/MODIFY
event if exactly identical item already exists.

Comparing the items may be costly, so this logic is controlled by
`alternator_streams_compabitiblity` flag.

This commit handles the following cases:
- `PutItem/UpdateItem/BatchWriteItem.PutItem of an existing and equal
  item: nothing`

2025-10-30 08:38:30 +01:00

5.7 KiB

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