Zitan Chen b5bae48c8a Fix db_id and db_session_id nullptr warning by clang analyzer (#7063)
Summary:
GetFileDbIdentities requires either db_id non-null or db_session_id non-null.
Passing nullptr for db_id or db_session_id in CopyOrCreateFile indicates the caller does not want to obtain the value for db_id or db_session_id.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/7063

Test Plan:
USE_CLANG=1 make analyze
backupable_db_test

Reviewed By: pdillinger

Differential Revision: D22338497

Pulled By: gg814

fbshipit-source-id: 2aa2dcc14d156b0f99b07d6cf3c731ee088272cd
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RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key-value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it especially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/ and https://rocksdb.slack.com/

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.

Description
A library that provides an embeddable, persistent key-value store for fast storage.
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