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Jingzhe Jiaand贾敬哲
cbe1308fbc
### What problem does this PR solve? Issue Number: close #61056 #66084 Related PR: #None Problem Summary: Add create-time Row TTL support with a hidden TTL column for both source-time and direct-expiration tables. The implementation removes dynamic ALTER enablement and dedicated full schema-change/backfill paths, keeps TTL configured only at CREATE TABLE time, and treats TTL as a post-merge row visibility rule composed with delete sign. Storage keeps ordinary compaction policy while filtering expired rows during reads and natural rewrite paths. FE/BE tests and regression cases cover property validation, hidden column construction, tablet schema propagation, visibility filtering, partial updates, planning behavior, and ALTER rejection. Co-authored-by: 贾敬哲 <jiajingzhe.1350@bytedance.com>