BlobDB: only compare CF IDs when checking whether an API call is for the default CF (#6226)
Summary: BlobDB currently only supports using the default column family. The earlier code enforces this by comparing the `ColumnFamilyHandle` passed to the `Get`/`Put`/etc. call with the handle returned by `DefaultColumnFamily` (which, at the end of the day, comes from `DBImpl::default_cf_handle_`). Since other `ColumnFamilyHandle`s can also point to the default column family, this can reject legitimate requests as well. (As an example, with the earlier code, the handle returned by `BlobDB::Open` cannot actually be used in API calls.) The patch fixes this by comparing only the IDs of the column family handles instead of the pointers themselves. Pull Request resolved: https://github.com/facebook/rocksdb/pull/6226 Test Plan: `make check` Differential Revision: D19187461 Pulled By: ltamasi fbshipit-source-id: 54ce2e12ebb1f07e6d1e70e3b1e0213dfa94bda2
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