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a1e235b1a4
Overwriting a collection cell using timestamp T is a process with following steps: 1. inserting a row marker (if applicable) with timestamp T; 2. writing a collection tombstone with timestamp T-1; 3. writing the new collection value with timestamp T. Since CDC does clustering of the operations by timestamp, this would result in 3 separate calls to `transform` (in case of INSERT, or 2 - in the case of UPDATE), which seems excessive, especially when pre-/postimage is enabled. This patch makes collection tombstones being treated as if they had the same TS as the base write and thus they are processed in one call to `transform` (as long as TTLs are not used). Also, `cdc_test` had to be updated in places that relied on former splitting strategy. Fixes #6084