Summary:
Pull Request resolved: https://github.com/facebook/rocksdb/pull/14854
External SST ingestion can already skip the open-and-scan metadata path when ingesting files produced by `SstFileWriter`. This extends that fast path to live SST files produced by a DB, so applications that move DB-generated files between DBs can request prepared metadata directly from the source DB and pass it through ingestion.
The API is intentionally limited to live table files whose metadata is already available from the DB and cached table reader. Callers remain responsible for keeping the source file alive and unchanged until ingestion completes.
Reviewed By: xingbowang
Differential Revision: D108440584
fbshipit-source-id: e732278ea194aac71f046b54234238b35c6fe0e5
5f66923d1e