v.20.9Improvement

TTLs Applied During Merge for Non-Materialized Records

Official CH changelog text
Now TTLs will be applied during merge if they were not previously materialized. #14438 (alesapin).
Now TTL expressions are applied during the merge process if they were not previously materialized.

Why it matters

This feature ensures that TTL (Time To Live) rules are enforced even during merges when they haven't been applied earlier, maintaining data retention policies more consistently and automatically without requiring manual intervention.

How to use it

Users do not need to enable anything explicitly; TTLs set on tables will now be applied during merge operations automatically if they were not already materialized.

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