this prevents stacking many useless SavePoints in transactions with
many operations.
The PopSavePoint method in RocksDB is forward-ported from upstream
RocksDB commit 90f744941d48f15d5d070dfcab5d51b77abac8ad.
This is likely to be released with a future release of RocksDB.
* fixed issue #3075
* update the known issues document, as some issues have already been fixed
* speed up equality lookups in unique vpack indexes
* fixed wording
* cleaning up several duplicate versions of Index::memory, Index::cleanup, Index::drop, integrating branch issue-383-ensure-delete
* fixing wrong column family
* Testing hash for documents
* fixing logspam error
* added base support for kHash in the edge index
* Current version of hash enabled edge index
* removed rocksdb key type byte, dynamic prefixes for hash-index
* Fixing issues with key classes
* Fixing merge conflict
* Fixing version with semi-working hash index
* fixing various issues
* Fixing hanger in EdgeIndexIterator nextExta, when _cache is disabled. Reenable cache
* Fixing geo index bounds, and fillIndexes error handling
* Adding back failure point
* Fixing RocksDBKey::vertexId
* Added version check on startup
* Fixing version check
* added one more check
* properly detect column families at startup
* Adding additional sanity checking
* Adding missing column family
* some fixes
* Turned off geoindex sync
* fixed error
* added asserts (untested)
* Adding more asserts