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628d7e709e
`system_keyspace::read_cdc_generation_opt` queries `system.cdc_generations_v3`, which stores ids of CDC generations as timeuuids. This function shouldn't be called with a normal uuid (used by `system.cdc_generations_v2` to store generation ids). Such a call would end with a marshaling error. Before this patch,`retrieve_generation_data_v2` could call `system_keyspace::read_cdc_generation_opt` with a normal uuid if the generation wasn't present in `system.cdc_generations_v2`. This logic caused a marshaling error while handling the `check_and_repair_cdc_streams` request in the `cdc_test.TestCdc.test_check_and_repair_cdc_streams_liveness` dtest. This patch fixes the code being added in 6.0, no need to backport it. Fixes scylladb/scylladb#18473 Closes scylladb/scylladb#18483